Queen was of frail health, possibly aggravated by living at high altitude. While pregnant with their middle daughter Dorothy in 1880, Queen suffered a heart attack in Leadville during a vacation. Dorothy was born a few weeks later at Glen Eyrie. Then, their third daughter, Marjorie, was born in England. Two maids and a doctor had accompanied them on the trip. Over the next four years, Queen often lived on the East Coast or England, with visits by Palmer. In 1885, she left Glen Eyrie permanently, due to ongoing health concerns, and needing to live at a lower altitude, she returned to her home in England. In about 1887, Queen began renting Ightham Mote in Kent, where she lived for 3 years. William and Queen vacationed in France and Italy in the spring of 1889. Following other heart attacks which prevented any return to Colorado, Queen died in England on December 27, 1894, at the age of 44.