Aww pobrecita, she must be so uncomfortable
12 teeth? Yeah, she's not going to want to eat much. Just make sure she's getting some water in her so she stays hydrated.
I'm sure your vet mentioned soft, wet food? If so, make sure you mush it up for her and make it into a lil pyramid, it'll be easier for her to eat when she does finally eat.
Poor little thing. She'll be all better soon!