I’ve always been afraid of hitting a deer in a couple of places I lived. But thankfully I was always able to stop in time. I hope too you just clipped her and that she was just momentarily dazed. I do understand why you feel bad. But there’s nothing more you can do.if there was nothing on your car no dent or anything then maybe you didn’t do any damage. So maybe slowing down for the frost was enough to save the second?