Spike has given a great amount of information to look for. Aqua therapy is also highly recommended if she has a difficult time putting much weight on her foot. It takes a fair amount of weight off allowing her to regain muscle memory and range of motion. Although I am sad to see someone so young end up with CRPS, her age is likely to help her go into remission. Children have the greatest chance of going into remission.

If you would like to gain some knowledge about CRPS, there are a great number of websites that can help with that. RSDSA an RSDHope are two of the better sites off the top of my head, but at the top of this forum's page is a resorces sticky thread that has a number of web pages listed in it that you might want to check out.

I almost forgot, do not let them use ice on her ankle. Ice is not recommended for use in calming down swollen areas that the CRPS is in.