That stuff on her belly looks like scale rot from to much humidity or her soaking in her own feces and urine, or it could be a burn from her sitting on a heat source that is way to hot. The prolapse of her anus could become infected and kill her, or it could dry and rot off, destroying parts of her genitals and her rectum, definitely not good. If you need to sell or pawn something to get the snake help I would do so, because your snake is in immediate need of professional medical attention... I have had to pawn a gun or two before for an emergency vet visit for a few of my snakes, sometimes you just cannot wait for the next paycheck they just need to go right away... It will end up being more than a 100 dollars easy, other than that I cannot tell you how much it will be.
Also if you have heating pads that are not regulated on a rheostat or thermostat that would probably be the cause for her burns, (if that is what they are).
A solution of sugar and a little water can be applied to a prolapsed anus to cause it to shrink, just gently slather on the sugar paste and it will draw water from the swollen anus, hopefully causing the swelling to go down. You will still need to take the snake to the vet though!