This could really be so many things....gastritis, IBD/IBS, ate something funny, pancreatitis (though prob would've been worse). What did the bloodwork present as?
Did you change food, treats, or anything? Has she had the "occasional vomiting w/ diarrhea" since you got her, or is this new?
I'd probably wait a bit to see if it resolves, indicating it was probably a bug/gastritis...and slowly introduce her food again. If it persists, she really does need bloodwork if it wasn't done, and may need a GI specialist.
If you truly cannot afford the vet, then I'd perhaps contact the rescue and see if there is any way they can help and/or whether they have any previous record of her having GI issues.
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°¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |