Thanks very much for the welcome and the advice, guys.
I'm very happy with Miss Molly, not to mention very, very lucky -- I think she's more housebroken than my husband and me are! She uses the doggie door faithfully without a single accident, sits quietly without begging while we eat (although with a winsomely hopeful, powerfully guilt-inducing stare, and much joy when a tidbit of chicken is forthcoming), loves to cuddle and have her tummy rubbed, has no objections to being brushed, and does the Happy Tapdance of Joy whenever my husband and I come home. She sleeps next to me on a pillow, and sleeps all night. She doesn't chew anything she's not supposed to, either! She's so well-behaved she's almost a Stepford Puppy. Her only remotely bad habit is that certain outside noises -- loud birdsong especially -- seem to annoy her, and she feels compelled to go outside and give a couple of barks and a grumbling growl to show them who's boss. She also seems very afraid of people on the few occasions I've taken her out; she trembles and pants. I'm going to try to take her out more often for short periods of time to socialize her a little more.
I'm so glad I have her - I didn't realize just how badly I missed having a Yorkie doing the Happy Tapdance of Joy just for me, or waking up to a warm fuzzy puppy lying under my chin, making happy little noises as I rub her tummy (makes getting up to go to work much harder, though!).
One more question, please; she hasn't been spayed yet. I definitely want to get this done, but I hate to do it while she's still adjusting to the initial bewilderment of losing her old home and gaining a new one; I also don't want her to grow to regard me as The Mean Lady Who Not Only Stole Me, But Made Me Get Stitches, which I'm afraid might happen if I spay her too soon (she's already had a full vet exam and some shots, for which she was very well-behaved but clearly not keen on). She's apparently been in heat twice, the last time two months ago. How long do you think I should wait to spay her? The vet pretty much just said I should get it done before her next heat. I'd like to get it done as soon as I can without traumatizing her.
Anna M.C.