The way she looks down there I would venture to guess there is a couple more. She is very big down at the base of the tail. If that doesn't get better soon you should get to the vet as they can become egg bound. Not to scare you or anything but just to let you know. I believe there is a "how to" deflate it and get it out on here...but that scares even me to try.
Some of the more exp. ppl can pipe in here....would a warm soak in a tub help???