Through the night, she sleeps a couple of hours at a time but does not hold it the whole night - sometimes we get up 3-4 times with her (that's the most). But she has never slept through the whole night without getting up to pee!

I am embarrassed to type that out!
The breeder we got her from says she thinks it is probably just a bad habit she has gotten into (getting up whenever she feels even the slightest urge). She sleeps with us several hours during the night but also sleeps some in her bed. She has never peed in our bed or hers either but will get down and pee on the bedroom carpet or bathroom floor if we don't get her on her papers quick enough.
As has been said before on this forum, they're cute, so they get away with alot!
I've turned her into the Yorkie I said she'd never be - SPOILED ROTTEN!!!!