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Gastric bloat is a very serious condition that can cause death if that's truly what it is.
You can give her a little bit of canned pumpkin (not pie filling) and see if it helps to move her bowels.
If she becomes lethargic, starts to vomit or show neurological signs like falling over and disorientation, you need to find an emergency vet.
Let me know if you have more questions.
I would just use tablespoon to start and then add more if you need it. It sounds to me like she has a little gastritis. Mucus is normally present in the intestinal tract and is expelled when the dog eats something that causes an upset stomach.
I would try the pumpkin and give her a little time for it to work.
Let me know if you still have questions.