My 30 year old mare was kicked in the jaw after she nipped at another horse. It was pretty hard and afterwards she ran off hanging her head low. There is an open wound where the hoof hit, bit it's small with just a bit a bleeding. I cleaned it and put wonder dust on it. She ate all her food but slowly and she's still drinking plenty. Should I be worried? I really can't afford a vet bill, but I don't want her to be in too much pain. Will it heal on its own? Anyone have experience with similar circumstances?