Wow sounds a bit OTT from the other parents. MY DS has been bitten a couple of times by another boy at FDC, the last time he had a big bruise in the shape of teeth marks, I was sad for DS but also for the other bub's mum who was just mortified. This other boy won't be 2 until August and he bites for no reason- just walks up to the other kids and bites them which i find more worrying than your DD's behaviour which has a reason.
I think you are doing all you can and TBH I think the other girl's parents need to think about their DDs behaviour too. I can't believe you have been asked to keep her out of care next week either, surely that can't be legal.
Anyway I have rambled with out actually helping sorry, :hugs: to you I think you are doing all you should/ can.