What kind of floors do you have? If she seems more wobbly on linoleum, tile or wood it could be because she needs the hair around her pads trimmed. It's kind of like wearing fluffy socks and sliding across the floor. I trimmed Scarletts whe she slept with a small pair of blunt scissors and a little battery powered eyebrow trimmer. The improved grip has given her more confidence and made her steadier on her feet.
Glad to hear the vet thinks it's age and not hypoglycemia that'd causing her wobbiliness. She's still at risk though, so keep an eye out. If you google "yorkie growth charts" you can find some guestimates of how big she'll be.
Did you ever hear back from the breeder?
BTW, I'm originally from the San Diego area, too. There are lots of great, dog friendly shopping areas there you can take her too when she gets bigger.
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