As
Winterrider
said, her teeth may be getting sensitive or even has lost a bunch. My oldest dog is a Cocker and he's almost 9. Earlier this year he got where he wouldn't eat much so I carried him to my vet for a checkup. The vet said he had some bad teeth and pulled them. WOW, what a difference that made in him and his whole demeanor. He was almost like a puppy again. Years ago I had a dog who had lost many of her teeth so I supplemented her dry food with a quality canned food. I would always wet her dry food with water or broth and allow it to get soft before feeding her. A little bacon grease on their food also will help them with their appetite as long as there's nothing else going on.
Buying quality canned food started me down a path towards making my own for 2 reasons. One was, as
@hillbillyrkstr said, I know what's in it and the other was to save money. I still make my own "wet" dogfood and have been for maybe 10 years. My recipe makes about 10 quarts, lasts me about 6 weeks, and it works for my current dogs as well as past dogs, they've all seemed to like it.
Edit to add that I'm very particular about the dogfood that I feed my dogs. My resource for dogfood recommendations is
can dog eat haggis. It's very informative and may surprise some folks with the recommendations on what many think is "good" dogfood. a quick check and Orijen Senior has a 5 star rating, their highest rating...