is a 28qrts tub to small for an adult female ball
Commercially available products for mite treatment are Black Knight and Provent-a-mite. Never heard of anyone using betadine or iodine, so I would be leery of that. My experience with pet store employees is that most don't know their head from their *ss when it comes to snakes, so I always consider doing the opposite of what they tell me. I can tell you that mites drown, so a good bath would help a lot. Just make sure the temp isn't too high. It should feel slightly cold to you. Water temp around 80 degrees. A bleach solution wash would be ok for her cage, just make sure it airs out completely.