I Got Anew Cat About A Month Ago She Is

I got anew cat about a month ago she is four yrs.old she seems to be hungry all the time.I feed her a half can of food in the morning and she is fine and half for dinner.I was also putting a small bowl of dry down for her but she has been vomiting her food so I stopped the dry.But she still vomits up her dinner not her breakfast.Coluld it be worms?I see none in her vomit.