She is Sonya's mother, and is mentioned a few times by Lazarus. She made no physical appearance, since she supposedly died in an landslide when she was helping villagers a few years after the Great Disaster.
However, a villager in Rostrum (Alt) did mention she was "dressed like a slut", shocking Sonya.
In the upcoming event teaser, Nero hypothesize that Sonya was transformed as an apoptosis as early as her presence in Karen's womb. It is unknown if it had an impact on Karen herself, and there's also no info on the identity of Sonya's father.
Trivia
- Because of the look of the latter, it is theorized she could be Adramelech.