I am sorry your baby is not feeling well.
dizziness and nausea in a dog her age may be due to diabetes or ingesting a toxin
She could have an ear infection causing vestibular symptoms
Read more on vestibular here
For vomiting withhold food for two hours. Then give a quarter of a pepsid:
I would pick up any dog food.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 from vomiting
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.
Do not allow her to drink a lot at a time if she throws up water, she can lick ice
Also give her one teaspoon a day of plain yogurt to keep "good" bacteria in her system.
If she develops any abdominal pain, bloating, constipation or cannot keep anything down she needs to be seen by a vet.
Please let me know how she is doing. I will always be here for you
I hope your baby feels better very soon..
Best wishes for her,