I have dealt with this issue at least once per year over the last decade or so of breeding, I have about 150 breeders so it seems someone is going to get bound. I have never had this exp with a hog though but I am sure it is pretty much the same.1st I would try soaking for 12hrs or so in warm water maybe gently try palpating it further down, take a cotton swab with mineral oil and lube her up a bit to help. If that doesn't work I would take her to a vet and have them pop the egg so it can pass,if you wait too long (48hrs -72hrs)it could harden into a rubbery mass that has to be palpated out which can be dangerous. Another thing sometimes the egg is deformed and way too big to pass, in this case I would take her to a vet immediately and see what they can do, if it is too high up they can take a needle insert it into the abdomen and drain the fluid that way, but this is risky and can lead to infection.
Usually if the snake has good weight and the egg isn't huge it will pass on its own but if you are feeling unsure a vets help can't hurt (as long as there a good one).
Hope this helps..