[1] Killick worked in the physiology department of the University of Leeds from 1929 to 1931, as an investigator to the Safety in Mines Research Board.

During this period she studied carbon monoxide poisoning and acclimatisation, and collaborated with John Scott Haldane from the University of Birmingham.

[3] Killick began investigating respiratory physiology and carbon monoxide poisoning in her first role at Leeds, and this was her primary research interest throughout the rest of her career.

She did, however, demonstrate acclimatisation over time, with her symptoms and blood carbon monoxide levels decreasing with successive sessions over a period of many months.

She died in London's National Hospital for Neurology and Neurosurgery on 31 May 1960, aged 58, from a cerebral haemorrhage.