Yeah, I think it steps up as they get older and spend more time on pointe instead of flat. There 1000% is no justification for the amount we spend on ballet! But yeah. I just try to enjoy the ride and know that they are studying something they love.
Jet glue and more than one pair so you can rotate them and let one pair fully dry out before wearing it again. Does she take them out of her bag and let them air out? My kids put desiccant packs in them to get as much moisture out.