It sounds like it could be a prolapsed vent. If so, I'd give her a warm water bath. After a bath, maybe you'll be able to see if it is a prolapsed vent. Look up some pictures, and see if it looks similar to your bird.
If it turns out that it is a prolapsed vent, I suggest continuing to give her warm baths at least once a day. This will help relax her muscles, and retract the prolapse. Put some honey and Witch Hazel on the prolapse to keep it moist and to shrink it. Some people also use Preparation H. I've also heard of putting sugar into the water when you give her a bath, as this supposedly helps shrink it too. When my bird had a prolapse, I just used warm water baths, Witch Hazel, and honey, and she recovered.
Make sure to keep her isolated from the other birds, as birds will pick at the prolapse. Has she been laying? You need to stop her from laying any more eggs, at least for a while. Keep her in a dark room, and only feed her at night. This is what I did when my chicken had a prolapse.
About twice a day or so, gently push the prolapse in. It likely won't stay in very long (as soon as she produces a dropping again, it will probably come out), but it will help strengthen her muscles. Give some calcium and vitamins in her water, too.
It can take anywhere from a day or two to a couple weeks for a prolapse to heal. My bird's prolapse was fine in three days. Hopefully, your bird recovers just as quickly!
Hope this helps!