E.A.
Hi J.,
I would not continue to watch this child in my home. In a public daycare setting (I've worked in daycare for years), the child gets 3 strikes with biting, and then they are dismissed from the daycare. It is dangerous, it can be unhealthy (if they break skin, they can pass on germs, diseases, etc.). In general, I would tell this mom that if she does not step in to correct her daughter's behavior, then you can no longer keep her daughter in your home because she is hurting yours! Good luck!
BTW, think 10 years down the road - if mom can't control dd's behavior now when she's not even 2 yet, do you really want this girl (when she's a teen) as a friend for your daughter? talk about negative peer pressure! just a thought!
E.