It looks like old shed, but real old. It appears to be starting to constric the end of the tail. You can see the point where it appears to be constricted about 2 inches up from the tip. Keep a close eye on it. I'd try giving her a bath a couple times a day and lightly rub her tail with a soft bristle toothbrush.
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!