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"His condition is considered stable" and "it is too early to make any predictions about his future health," Lola Karimova-Tillyaeva wrote on her Instagram account.
Ms Karimova-Tillyaeva pleaded for people to "refrain from speculations".
Mr Karimov, 78, has been leader of the former Soviet republic since before independence in 1991.
In an unusual move on Sunday, the Uzbek government admitted he was receiving treatment but did not give details.
The BBC's Abdujalil Abdurasulov says that the announcement caught many by surprise in authoritarian Uzbekistan, a country where any information about the president's health is treated like a state secret.
President Karimov is known to have had health issues, but the government has never previously issued a statement about his health.
It has become a tradition in Uzbekistan for the president to dance during major holiday festivities.
By doing so Mr Karimov sends a message to the nation that he is fit and healthy.
Everyone was expecting the president to attend Independence Day celebrations - perhaps the government's confirmation that he is in hospital was a necessary move to prepare the public for his non-appearance.
Tashkent-based human rights campaigner Surat Ikramov says that most people are too afraid to talk openly about Mr Karimov's hospitalisation in one of the most repressive countries in the world.
"Any vocalisation that Mr Karimov's power is not absolute is seen as a threat to the entire system," says Human Rights Watch spokesman Steve Swerdlow.
"Even if he survives this illness or whatever it is, this is an acknowledgement of [Mr] Karimov's mortality, and of the fact that the system is about to change."
Uzbekistan opens up on president's health
Profile: Islam Karimov
The Kremlin said on Monday that it deeply regretted Mr Karimov's illness. It refused to comment on whether there was concern in Moscow that it could enflame uncertainty in Central Asia's most populous country, which borders Afghanistan.
"The Kremlin wishes a quick recovery to the president of Uzbekistan," spokesman Dmitry Peskov said.
"We would like to receive only positive news about the president's health."
Mr Karimov was last seen on state TV on 17 August, meeting the South Korean interior minister.
Independence Day celebrations - which the president would always attend - are to be held on 1 September.
In her message, Ms Karimova-Tillyaeva, who serves as Uzbekistan's ambassador to Unesco in Paris, asked people "to show respect to our family's right to privacy".
There have been a number of occasions when the president was rumoured to have a stroke or a heart attack.
The last time it happened was just before the 2015 presidential election, when Mr Karimov was not seen in public for several weeks - fuelling rumours about his poor health.
Uzbek President Islam Karimov is in intensive care after suffering a brain haemorrhage, his daughter says.

Despite his illustrious career in the dugout, Fullone had fallen on hard times and died in abject poverty in Casablanca, Morocco.
The Argentine was nicknamed 'The White Magician' by fans in Ivory Coast where he turned Asec Mimosas into one of Africa's leading clubs.
His finest hour with Asec came in 1998 when he led them to the African Champions League, beating Dynamos of Zimbabwe.
A year later, he won African club football's flagship tournament with Raja Casablanca of Morocco.
He also led another Moroccan side Wydad Casablanca to the African Cup Winners' Cup title in 2002.
Four years later, he underlined his status as one of the most successful foreign coaches in Moroccan football history by winning the Arab Champions League with Raja.
Aside from coaching several high-profile African sides, Fullone was also a familiar figure on the Middle East coaching circuit.
Oscar Fullone, the Argentine coach who won back to back African Champions League titles in 1998 and 1999, has died aged 78.

The leaked report says helicopters dropped barrel bombs holding chlorine gas, a prohibited weapon, on the north-west province of Idlib in March 2015.
An earlier report by the Organization for the Prohibition of Chemical Weapons (OPCW) blamed the Syrian government for two other gas attacks in 2015.
The government has not yet commented.
Syria agreed to destroy its chemical weapons in 2013 under the terms of an agreement negotiated between Moscow and Washington.
The Security Council backed up the agreement with a resolution that if Syria did not comply, it could face sanctions or military action under Chapter 7 of the UN Charter.
The latest findings - the fourth report from the 13-month-long inquiry by the UN and the OPCW - accused government forces of carrying out the toxic gas attack in Qmenas, Idlib governorate, on 16 March 2015.
The conclusions could herald a disagreement between the five veto-wielding powers on the Security Council, correspondents say - with Russia and China against the US, the UK and France.
The OPCW's third report, submitted in August, also accused the so-called Islamic State (IS) group of using sulphur-mustard gas.
At that time, Russia argued that the conclusions against it and the government should not be used a pretext to impose UN sanctions.
The use of chlorine as a weapon is prohibited under the 1997 Chemical Weapons Convention, which Syria joined in 2013.
The latest report, which was supposed to be confidential but was widely leaked, accused Syrian government forces of using helicopters to drop barrel bombs, which in turn released chlorine gas.
The report said that the helicopter flights could have originated from two bases where the 253rd and 255th squadrons, part of the 63rd helicopter brigade, were based.
Navy helicopters from the 618th squadron were also located at one of the bases.
But the inquiry said it "could not confirm the names of the individuals who had command and control of the helicopter squadrons at the time".
It recommended that those "with effective control in the military units... must be held accountable".
The US ambassador to the UN, Samantha Power, has described the use of chemical weapons as "barbaric" and called for "all states to support strong and swift action".

Syrian government forces carried out a third chemical weapons attack last year, a confidential report to the UN Security Council has found.

