She needs exercise before she is going to start respecting you.

I have really bad knees and can't even walk a mile. (about 1/4 is my limit.) I'm still able to exercise a Husky enough to get her to listen to me. (and that's quite a feat. Huskies are independent and could care less about what YOU want.) Not only that, but i got a dog that's bread for pulling to not pull so much on lead. (for suggestions, look up the many recent posts on walking. I've posted much advice in them. The one thing I do have to mention though in case you don't look them up is get a long training lead and take her to a field. Let her do her running that way.)

You have an advantage over me that I don't have with this foster dog. Mine doesn't get along with about 2/3 the rest of the dog population. Since yours does perhaps you could take it to some dog parks. That should wear her out.