what an absolute bitch, she sounds completely poisonous. However, whilst of course yanbu not wanting to talk to her again, perhaps it would be an idea to go a bit further than that and actually tell her how appalled you are that someone could do this. Also, it may be an idea to mention to the nursery how toxic you find this and you hope that they will explain how inappropriate it is. Absolute cow.
My dd was a pincher for a while, it lasted a couple of months, but it is unimaginable now, she is the sweetest, most sensitive gentle funny little girl you could imagine, I would have been mortified and absolutely furious if someone had done something like this to her.