Have Cat Questions? Ask a Cat Vet Online.
After a dental and removal of teeth, the discomfort can last long enough and be significant enough to prevent eating, along with causing her stomach to be upset. Her change in personality is very likely due to post surgery.
See if she will eat non-spiced chicken baby food; boiled rice and boiled chicken; or plain yogurt. These foods are palatable, easier to eat; and bland enough to ease her tummy discomfort. For constipation, PLAIN canned pumpkin(NOT pie filling) is a very good home remedy and provides fast results. She only needs a small amount daily - about 1/8 of a tsp.
Hopefully with eating one or all of the above, she will gain her strength back and feel a lot better before you can take her into the vet.
Best of luck and well wishes,