I think your kitty may have a tummy that needs special food. There are all kinds of special diets - furball oriented, blah blah blah. My guys are on WD Prescription Science diet because they had blood in their stools quite often. I do give them 1/2 of wet food each night, to share, so they do have some wet food to go with their lousey dry food. I would feed her alone, and give her the food that she can keep down. You might want to try to keep her teeth brushed as well, since dry food keeps their teeth cleaner and if she isn't eating dry food, then her teeth will probably get tartar on them much more quickly.

A call to the Vet might help as well. They may just give you a suggestion over the phone.

Good luck.