I've only known a couple girls who have had this (compared to Osgoods) but some of them use heel cups. I wouldn't be averse to that but I would be a little concerned about getting dependent on it or using it to mask pain when some time off of tumbling on harder surfaces, etc, would really be better.
This is usually more the advice for plantar fasciitis, but I'd probably recommend it for any heel pain just because it's generally a good course of action. She should really try not to go barefoot, even in the house - it can't hurt, and the arch support might help with the pain. A pair of slip on clogs or something like that with arch support kept in her bedroom would be good. I've heard some people say crocs are good, but I haven't ever tried them so I don't really know myself.
Definitely freeze the ice in Dixie cups and peel back the top of the paper so you can hold the bottom and use the top to ice.
I would be wary of relying on OTC painkillers, because I've known a lot of people who would use them before practice and then they just built up a tolerance for it. A lot of times with was without the coach's knowledge - they had to make a rule that if you wanted to use OTC painkillers at practice, it had to be in the office labelled with your name and what schedule you could take it on (from a parent). They have their place, but you kind of have to be careful with them. You don't want to be masking a problem at a young age and continuing to train on it. If she is having pain and needed Advil before practice, I'd definitely tell her coach or send a note if you don't drive her, so the coach will be aware that she might have to modify her practice. Sometimes young kids don't speak up or it is hard to accurately gauge their pain level. The parent knows the child much better so it can help to get that info firsthand.
Stretch. You can use a stair case and stand on one stair with your heels hanging off the edge and let it stretch through the foot. Sit in pike and pull the toes back.
Heel cup link (from above): g195 the cheetah
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