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I am sorry to hear your kitty is not feeling well. It sounds like she has lost a significant amount of weight! And it is not good for her to be vomiting so frequently. Poor kitty!
I suggest taking her back to the vet for repeat bloodwork including thyroid testing, pancreatitis test (fPL) and a GI panel (cobalamin and folate).
She may have an inflammatory bowel disorder which can be treated with medications and a special diet.