Both her son Jonathan and her daughter Sian had mental health problems and both took their own lives during the 1990s. Warner's own health had deteriorated and she retired a year early in 1996 but remained active in supervising Ph.D. students and working on research.
Pareho ang kanyang mga anak na lalaki Jonathan at ang kanyang anak na babae Sian ay kalusugan ng kaisipan at mga problema sa parehong kinuha ang kanilang mga sariling buhay sa panahon ng 1990s. Warner sariling kalusugan had deteryorado at siya nagretiro sa isang taon sa unang bahagi ng 1996 ngunit naiiwan ang aktibo sa nangangasiwa Ph.D. mag-aaral at nagtatrabaho sa research.