Sometimes, an abrupt change in dry cat food can cause vomiting - slower introductions to dry foods usually work better to allow a cat's system to adapt. Seems to happen more often with dry than wet for some reason. But, if she will willingly eats the Whiskas and doesn't vomit anymore, best to stick with it. If she tires of it, then you can consider slowly trying other dry foods.She does sick again today I think. Found food in her hut. I think she is allergic to purina branded food. Her stomach is sensitive to that. Will strictly stick to whiskas and not change it up
Is she still eating at least some wet food?
Btw - if the food looks undigested and she threw up very shortly after she ate, that is called regurgitation and can happen if a cat eats too fast.
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