At a all. Senior girl won’t eat

Muriel has always been a good eater. Now in her older age, 11, she’s been slowing down.. in a lot of ways. First, she stopped eating kibble, so I mixed kibble with wet. That lasted about a week until she turned her nose up. So we tried the same cans, but with no kibble. Lasted for about a week. And when she turns her nose up, she just won’t eat for days until I find something better. I ended up getting some Purina One cans that she loved… and now hates. So today I had the bright idea to get a rotisserie chicken. Ripped about a cup off the carcass, excluding any skin, and this girl GOBBLED it up. I ended up giving her another cup just a minute ago, and again, she devoured it. Idk what to do. She clearly had the desire to eat something, she just hates what I’m putting down. I also know that there is a ton of sodium in that kind of chicken, so it can’t be a regular thing… at the same time? She’s 11.. I kind of think she should have a pass to eat what she wants. Idk. Help?