By 1925, Tschaikovsky had developed a tuberculous infection of her arm, and she was placed in a succession of hospitals for treatment. Sick and near death, she suffered significant loss of weight. She was visited by the Tsarina's groom of the chamber Alexei Volkov; Anastasia's tutor Pierre Gilliard; his wife, Shura, who had been Anastasia's nursemaid; and the Tsar's sister, Grand Duchess Olga. Although they expressed sympathy, if only for Tschaikovsky's illness, and made no immediate public declarations, eventually they all denied she was Anastasia. In March 1926, she convalesced in Lugano with Harriet von Rathlef at the expense of Grand Duchess Anastasia's great-uncle, Prince Valdemar of Denmark. Valdemar was willing to offer Tschaikovsky material assistance, through the Danish ambassador to Germany, Herluf Zahle, while her identity was investigated. To allow her to travel, the Berlin Aliens Office issued her with a temporary certificate of identity as "Anastasia Tschaikovsky", with Grand Duchess Anastasia's personal details. After a quarrel with Rathlef, Tschaikovsky was moved to the Stillachhaus Sanatorium at Oberstdorf in the Bavarian Alps in June 1926, and Rathlef returned to Berlin.