[Anonymous]

I would see the vet, at age 13 she is a senior, and if she hasn’t had a checkup and lab work done in the last 2 years, now would be a good time.
Sudden changes in bowel habits such as fecal incontinence, are always red flags.
Her problems may have nothing to do with her diet.
Good luck and please give us an update (if you feel like it)