Quote Originally Posted by sebb46 View Post
One day she came home to find that the heating pad had malfunctioned and her entire belly was covered in blisters.
Was the heating pad regulated by a thermostat? This is the difference between an accident and a mistake.

The resulting input is still the same. Get that heat pad regulated on a reliable thermostat or rheostat, paper towel substrat, (I believe you did both of those) and go see a vet!