People like different foods. There are some very $$$ foods made for Yorkies. Some people cook foods for their furbabies. My Lucy gets Eukanuba Puppy. At 6 months, she prefers the larger sized puppy bites.
As for chews, Lucy loves Bully Sticks. However, she's had a little tummy trouble lately and I've learned that some yorkies can get a little tummy irritation from their chews. Rawhide is not good for a yorkie. She also loves the sock-like animals that are lightweight and look like squirrels or mice. Some people like to use the Kong toy (put peanut butter inside.) Lucy couldn't be bothered with it.
Lucy also enjoys gnawing on my son's socks.... Or any loose laundry for that matter.
Best wishes with Bonnie and I hope you can post some pictures soon!
Good luck.
Tracey