She looks like she has been beaten up very badly. I would suggest that you get her into a specimen box (hang it inside the tank so it stays warm) and put in a good amount of Stress Coat. That contains aloe which will help restore her slime coat and then her fins can repair. Make sure to exchange the water about twice a day and feed her well.
This is what starts to happen when you have one male to one female. It isn't pretty.
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