I guess she could.
I hate this sort of crap! How can someone be responsible for another's actions or lack of talent when you have no control over the situation?
If you are really worried I'd have as brief a conversation as possible with an attorney (billable minutes, you know). And do not offer anything to her...no settlement. Hopefully this will just go away although she will probably be shooting off her mouth about you for years...at which point you may be able to sue her for damaging your business. : )
If you ever find yourself in a fair fight, it's because your tactics suck. ~ Marine 1SGT J. Reifinger