But from what I understand, you are not an actual VETERINARIAN, so you are out of bounds to be giving veterinary advice - especially if she is (obviously) having her dog treated by a vet. Even then, a veterinarian wouldn't be giving such advice over the internet without seeing the patient first-hand. There are legal consequences that could come from doing so.
She never said your experiences were untrue. She simply stated that the type of injury that her dog has do not heal on her own. I'm not educated in this field (yet), so I cannot comment.