Great. Thanks for the additional information. I really appreciate it.
So my biggest concern here is that your girl is showing some signs of a pretty serious problem. A possible obstruction....the trembling (which is often a sign of pain) and vomiting immediately after ingesting anything in the days after eating something they're not supposed to are HUGE warning signs that your vet needs to be seen by a vet immediately.
An intestinal obstruction (likely caused by the depends) is what happens when the dog ingests something that is too big or too bulky to pass through the digestive tract the normal way. It gets stuck on one of the turns in the intestines and stops the flow of everything, causing your dog to get sicker and sicker until the intestine ruptures (if left untreated).
This is something that is absolutely, positively worth the drive to the emergency vet on a Sunday. Since your dog is already showing signs of obstruction I would strongly urge you to NOT wait until morning to have her seen...intestinal obstructions can turn fatal very quickly, so time is of the essence here.
At the emergency vet, they'll take an x-ray to see where the obstruction is and if it's still high up in the digestive tract, they'll have to remove it surgically.
You can read more about obstructions below:
All that being said...if there isn't an emergency vet in your area, then you could continue to monitor her today. If she has more episodes of vomiting and trembling, or if she develops any other signs, then you should have her seen first thing in the morning tomorrow.
I hope everything works out.