S.G.
Hi S.,
We just went through this with my son, he will be three in June, I had read on the internet somewhere people had said they put their kids in high top tennis shoes but that they are hard to find. Well we had a pair of boots and this winter we put him in the high top boots and it has almost corrected the problem. Sometimes when he is barefoot he will still walk on his tip toes and I just remind him to walk flat footed and he will, I think when he is barefoot it is more habit than anything. I don't know if you would have any success finding high tops especially for a girl but that is what worked for us the high top boots.
Good Luck, Steph