We're keeping an eye on it. Right now it's just something cute she does, but if it starts moving beyond self soothing we'll step in and try to help.
Yesssss! By the way, mine sucked his tail and lovingly licked the walls (?), when he was Val's age. He's not entirely normal yet 2 years later (he chases his tail and noms on electric cables, is very scared of his shadow but would chase after cats 3 time his size, and would slurp stagnant gross water instead of his fresh water bowl) but he's healthy?