Oh no!!!!! I would think you should take her in if she is not keeping anything down. Pinch the skin on the back of her neck- the really loose stuff. If it does not FLOP back down she is dehydrated (internally)
Pedialyte- maybe to help. I dunno. I think I would just take her to the vet, especially if it continues. She may have eating or swallowed something bad.
Has she been eating grass?