keeping my fingers crossed that she is ok.. how scary for you and her.
My sheltie is on medicine for seizures, he just stares in space when he has them and if hes not in his crate he just keeps backing up. Its very obvious that he is having one. All dogs, like humans siezure different. Even though I know when he is having one, its so scary to watch it but I make sure Im there to comfort him when he comes out it and sometimes it does take a little while for him to get back to normal. It sounds like your little one was having a seizure because of how long it took for her to start acting normal.
Update as soon as you can..