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If she is vomiting often and the food looks like it has not been digested, there are two causes for concern.
One - she could have an intestinal obstruction that is not allowing the food to pass. If you suspect this, you need to see your vet right away.
Two - She has a reflux problem and is vomiting because of the irriation.
I think that you need to see the vet at this point for an exam and to rule out a parasite problem as well.
Let me know if you still have questions.