Might try rinsing off the F10 etc...in case she is somehow sensitive to it? & then whatever the vet can check. Keeping fingers crossed that something shows up.
I do vaguely remember something about a snake with internal issues that shed more often, & I know for a fact they do with external injuries. It may be that those
"mystery cases" had something undetected internally that triggered repeat sheds to "repair"? Did Jeff have a necropsy done on those 2? I'm guessing not...