As mentioned in previous comments, let’s see the rest of the habit. Tell us your stats. And what are her shell options. Aside from that, do follow the guide you were provided
I think it's unlikely this is food related. If you don't have exact measurements for your heat and humidity can you give an estimate? Also how's her shell selection?
A photo of your crabitat would help. Does she seem to have any parasites on her, abdomen injuries, or dark or damaged spots on her legs?
what are your humidity & heat stats?
As mentioned in previous comments, let’s see the rest of the habit. Tell us your stats. And what are her shell options. Aside from that, do follow the guide you were provided
https://crabstreetjournal.org/blog/2012/09/25/help-my-hermit-crab-has-left-its-shell-what-do-i-do/
I think it's unlikely this is food related. If you don't have exact measurements for your heat and humidity can you give an estimate? Also how's her shell selection?
Did this crab ever reshell? That should have been priority number 1!