I've had senior girls in the past. These are a few things that I have used:
1) Little Cesars wet food available at Wal-Mart and grocery stores and comes
in different flavors. Have you tried this one?
2) Ground chicken or ground roast beef (some like it mixed with rice) with
broth.
Mine loved chicken and noodles...
3) Cottage cheese
4) Baby food is another thing I've used toward the end of their lives, but
if they were pretty sick and healing then I found feeding them broth helped
to build them back up, plus they loved the taste.
I'm sure there are some things I've forgotten over the years, but I hope this helps some. Let us know how it goes. OK?