Has the vet discussed IBD with you or given you any causes for the sores in the mouth? Could it be from the stomach acid in the vomit?
Purina is really a poor quality food and I highly recommend changing to a high quality cat food such as Wellness or Nature's Variety Instinct, canned varieties only as your kitty may not be getting enough water due to vomiting.
http://www.wellnesspetfood.com/cat_w...can_index.html
http://www.naturesvariety.com/instinct_cat_can
Here is some reading on cat food and nutrition:
http://www.catinfo.org/
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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