Definately take her to the doctors hun, I was kicked there in grade 3 and ended up with some internal bleeding. it was excruciating (sorry can't spell) for me especially to pee. But yeah, I'd get her checked JIC. atleast then you can put your mind at ease knowing she is ok. I hope she gets better soon the poor little love, heals very quickly.... and as for that little mongrel, I hope he gets everything he deserves!