Are you sure it's not Bumblfoot ?
If they have sores on the bottom of their feet, they won't put presure on that foot. I would try and capture her and look at the bottom. If you think it's actually broken, you can set it with a popcicle stick and some stretchy tape. (and seperate her from other birds for a few weeks) I would rule out bumblefoot before you set her foot but if it's actually broken, it will heal its self with some doctoring by you. Good Luck !! Keep us posted !