Ants receive cold different than us. At first, they try to hibernate, so basically she dies in her sleep. Also, I do not think you would want to step on a queen this big, that would make a decent splat... Anyway, I checked on her today and she seems a little better. Maybe it is not a permanent thing. Also, all her brood is in a pile again, except for one.
She did pull off her own leg. That can't be considered perfectly normal... but we will see.