Studied mycotoxins among other things in my B.Sc (Microbiology, minor Medical Microbiology) and recent research shows that black mold toxicity is more mythical than factual.
Some light reading:
https://link.springer.com/article/10...016-017-8601-z
Still, she needs that GONE regardless. Sodium Hypochlorite will get rid of it quickly and keep it at bay for a good while.