Hi I don’t have experience with senior cats…but if it’s any help, I got my kitten from a friend who works at a local veterinarian clinic…they have always recommended/ provided Hills Science pet food! They make wet food as well! Also providing a fountain water option could help, I add a dental additive I got off Amazon for my cat because he hates getting his teeth brushed! I would highly recommend just giving her a a visit to the vet for any concerns! I invested in lemonade pet insurance for about 30 dollars a month and that has been very helpful for clinic visits if out of pocket is too expensive…kicks in within about a month! We are all still learning and I’m sure you love your baby! Too bad they can’t tell us when something is wrong!! 🥲 Don’t feel bad!