When you say that she had a bloated belly but it's gone down, does that mean it is still somewhat bloated? Does she have load gurgling sounds from her stomach? What do her poops look like and is she still eating normally?
The mucous in her poop isn't a good sign. Was that very long ago? It might be that her stomach issues are affecting her drinking and peeing in some way too. Has she been to the vet at all? If she's eating well and pooping, I don't know if there is anything the vet would do besides having you change her diet, so I don't know if taking her to the vet at this point is useful or not.
Will she still not eat very much hay? What about if you don't give her any pellets at all, will she eat the hay or just not eat? If she's having these digestive issues, I would almost think that a hay only diet would be best to get her healthy again, but will she eat the hay? Are you feeding her grass or alfalfa? I have a rabbit that kept having problems with GI stasis and I couldn't give him pellets anymore, but he absolutely would not eat hay. So I found a compressed alfalfa/timothy horse feed pellet that he would eat, so that's what I did. Maybe you could try something like that.
There is a possibility that it's not the diet and that parasites or bacteria are involved, and in that case a vet is necessary.