Exuviae (old molted skin) sometimes doesn't come off cleanly all around, in fact she's probably had a least a couple chunks left behind in previous molts, but often they can clean it up after either by chewing it off or letting a future molt take care of it. One thing to remember is the importance of humidity when molting, she may have had trouble getting her feet all the way out because of low humidity. The good news is she'll get another chance to get it right with her next molt.
If you can find something that she sticks to (try a chunk of tree bark, a slice of pool noodle, a sponge, etc... things with lots of pores) then she will probably molt in a number of weeks just fine. *You do have a moderate-to-high risk situation on your hands* because she will rely on those malfunctioning feet during her next molt. So you want to try to hedge your bet and find surfaces she can work with. If you know her molting pattern you can predict when she will molt and supervise her - you can assist the molting process if you have precision tweezers and are there at the right time - but again if you find a good surface for her that shouldn't be necessary.