she hasnt gotten into any poisons or anything like that?
It's common for a dog to shake when it's in severe pain. This dog needs to be seen by a vet ASAP. Don't wait until tomorrow, if she has a problem like bloat (gastric torsion / volvulus), tomorrow morning will be too late. She needs to be seen NOW! Please let us know what the vet says.
Ghilly
I would take her to the veterinarian clinic, or at least call at vet in your town and ask.