My oldest is only 2.5 and not shy so I don't have any "been there" advice. I was thinking, though, that maybe it could be from moving? Maybe all the change has made her a little unsure of things and so she feels more secure with the people who are still the same as what she's used to? I don't know that I'd put a child in preschool just for that reason... It sounds like you are doing things where she has a chance to socialize so it's not like she's just always at home and never seeing other kids. My gut feeling without knowing your daughter is to give her time to adjust to the move and see if she starts getting more sociable. If you come to MOMS Club events, there's a bunch more kids to interact with so that may help, too.

Good luck!

Michelle