The lastest picture looks like the abdominal wall is showing, free of skin. She may have had her abdomen pecked by others, which can lead to serious injury and cannibalism. I would look very closely for maggots, which would look like shiny moving worms. Do you see a prolapse? If you chose to...
Can you start a new thread and include pictures of the vent area? Is her tail up or down in position? Has she been laying eggs recently?
I just saw where you did post a thread. Please include a picture. If possible take her in where flies do not get to her. A simple soak in a dish pan or sink...