I am so sorry your dog is not feeling well.
It sounds like she has vestibular syndrome:
This is common in older dogs and often mistaken for a stroke or seizure. It is usually caused by an ear infection and resembles human motionn sickness. It is usually NOT serious!!
It can be treated with antibiotics and steroids and sometimes even resolves on its own.
Try a small amount of boiled chicken with all fat drained off, chop meat , or baby food with no onion, beef, turkey, etc add cooked white rice or infant rice cereal.
Go very slow so she does not throw it up.
Dogs get dehydrated and hypoglycemic very easily
Add unflavored pedialyte to her water 50/50 to hydrate her and balance her electrolytes.
Put a drop of pancake syrup on her tongue to raise her blood sugar in case she is a bit hypoglycemic. That should perk her up.
Please let me know how she is doing. I will always be here for you
I hope your baby feels better very soon..