She may need to go on an IV at the vet tonight.
Dehydration can lead to electrolyte imbalance an then cardia arrest and it sounds like their is nothing you can do at home to stop this from happening.
What did she eat yesterday?
Shakiness would probably either be pain or maybe low blood sugar.
Even if you get her to eat, she most likely won't keep it down if she can't keep down liquids.
If she can do liquids, how about pedialyte?