[cypher]

That is a bit unusual if she was settled before & it's a sudden change in behaviour, has anything else at all changed, anything different in her environment not just her tank? Anything else going on around her, change in routine, change in temperature even! It's hard to guess tbh.
Her tank isn't a bad size but if you have a photo it might help to see if there are any changes that might help keep her busy & happy in there.