Amelia Croft
From WikiRaider
Lady Amelia Croft, the Countess of Abbingdon, was the wife of Lord Henshingly Croft, and the mother of Lara Croft.
Until Tomb Raider Legend, Amelia was presumed deceased but was in fact the victim of a tragic incident involving her daughter and a sword similar to Excalibur, where she appeared to have been imprisoned in Avalon.
Amelia does appear in Tomb Raider Underworld but as a Thralls.
Lara's mother in the Comics
In the Top Cow biography of Lara, her mother was called "Lady Elizabeth Croft" [1]