Out of curiosity why have you
allowed this
vomiting to go on for 6-9 months. If this were my cat,
and my cat was
vomiting after each meal, you better believe I would
have visited my vet a long time ago. Purina at best is not a good quality
food. She probably has lost weight but you just don't see it. I would
suggest making an appointment and getting her to your vet as soon
as possible. Vomiting after a meal for such a long time is not good.