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I am sorry to hear Minx is vomiting so much.
There are dozens of reasons for vomiting in cats: something she ate, parasites, infection, liver disease, kidney disease, pancreatitis, inflammatory bowel disease. Even heart disease and heartworm in cats will cause vomiting as the main symptom.
You can try giving her some Pepcid AC (Famotidine): 2.5 mg twice daily.
To find out why she is vomiting, the place to start is a thorough physical exam: listen to heart and lungs, palpate internal organs and lymph nodes, etc. If this continues, and if the Pepcid does not help, I would have her checked out by her veterinarian.
Good she is defecating normally; that pretty much rules out an intestinal blockage, and her gums being pink not pale shows she is not seriously ill at this time.