Milly Caller was arrested on 15 January following the death of Emma Crossman in Sleaford.
The 22-year-old, from Great Hale, near Sleaford, is due to appear before magistrates in Lincoln on 16 October, police said.
Ms Crossman was found dead by police officers at a property in Leicester Street, Sleaford.
A woman has been charged with assisting the suicide of a 21-year-old woman, Lincolnshire Police has said.