So my baby ball shed with me the second time and for the second time the smallest fraction (smaller than a millimeter) of the tail didn't shed. The first time this happened I didn't know what it was and that piece smaller than a millimeter actually fell off.

My problem is i cant take it off so any suggestions?
Since this is the second time she shed everything except that tiny piece of tail is there a way to prevent this?
I make sure her husbandry is right all the time and it doesn't make sense that everything comes off except this.