I have a 1 yo who has gotten really bad at swatting and grabbing the other kid's faces. The parents are also redirecting her at home as I am "no hitting, gentle" and they are being vigilant about trimming her nails. I have been monitoring when it is happening and it seems to be when a kid gets in her space but also when she tries to interact with others. I have also been redirecting the other kids to keep their faces away from her to prevent further injury.
Any other ideas?