Hi,
You can certainly try pepcid for the vomiting. The dosage for cats is 0.25 mg per pound of body weight once daily. (Yes, it is given everyday.) Baby food meat is fine to feed her as long as you check the ingredient list for onions or onion powder to make sure there isn't any. If she isn't drinking well, pedialyte is also good to use. Just get the unflavored variety.
If she currently eats dry cat food you could try giving her canned instead as it is easier for many cats to digest. One other supplement that may help her is Prozyme. It is a digestive enzyme that you sprinkle on her food. We use it at the veterinary clinic I work at with success. Here is a link to a page about it:
http://www.prozymeproducts.com/
If you have further questions let me know. If this answers your questions please click accept. Thank you.
Lynn
Veterinary Assistant
worked at a vet clinic for 15 yrs, BA in biology, have had cats most of my life