Actually, proud flesh is NOT tissue raised above normal tissue, it's the term used when granulation tissues is grown higher than the skin level, but granulation starts deep in the wound. It starts forming on the base of the wound bed, and will fill the wound as it tries to heal it. That wound is clearly starting to granulate, as you can see from the deep pink of the flesh, with the typical "buds" forming. The wound desperately needs to be wrapped to prevent the granulation exceeding the wound boundaries, and the best way would be to call a vet to assist you the first time so you can figure out a safe way to do it. It may be that she needs to be sedated to get it done, or you might be able to twitch her. Either way, it needs to be seen by a qualified veterinarian who can then decide on an appropriate course of action from this point. It definitely should have been seen from the start - looking at that wound, I wonder if it could have been stitched, which would have really benefited the treatment greatly.