She's ADORABLE !!!
My feeling is to go for it ...I agree she may be missing but the wait time is at least long enough for owners to contact all the shelters if they're looking... and I agree that too many people drop off dogs because they basically don't want the responsiblilty or a dog is ill - but if she's been vet checked and sounds healthy - go get that baby !!!
and I bet we're going to be seeing way more yorkies in shelters now due to the overbreeding ......it's a sad thing

but happens when a breed gets popular.
I'm sorry about your Precious...that's so sad
All the best to you - she looks like she really needs some good lovin
EDITED !!! so sorry - just saw your update we posted at the same time lol !! I'm so glad for the people who were missing her .....and now I'll wish you all the best on the one you just posted about !!!