Life leading up to The Sims 3
Not much is known about her life in The Sims 3 since she is already deceased and can only be found in the family tree and in the family graveyard in the back of the Schweiger mansion.
It's notable though, that her ghost appears to be a child, that died from starvation. Also through the family tree you can discover, that she is the half-sibling of Satinav Schweiger. While having the same mother, their fathers are two different sims.
Life leading up to The Sims
Since she is still deceased, there's nothing new to learn about her. Her tombstone is still standing in the family graveyard of the Schweiger family.
Life leading up to The Sims 2
She is still deceased and her tombstone is still on the lot of the Schweiger mansion. Her ghost still appears to be a child, that died from starvation.
Life leading up to The Sims 4
In this alternate universe, she's still alive, although with a different name. It appears that she changed her name from Deirdre to Calcatrix and married Weri Pekuleah and thus taking his surname.