Nicola Collingbourne was found at her home in Ivel Court on the Jackman's Estate in Letchworth on Tuesday.
Yvonne Caylor, 52, of Grove Road in Hitchin, will appear before Hatfield Remand Court on Monday.
Hertfordshire Police said officers want to speak to anyone who saw a person "of large build wearing a high-vis jacket" near the flat on Monday morning.
A woman has been charged with murder after a 26-year-old was found dead at a flat in Hertfordshire.