The world is a bigger place to her now. She's noticing things at a different level, she's comprehending a lot more then she did before, and it can be very intimidating. It's normal for children to suddenly feel timid and shy when they're approached by people they don't know. They are comfortable with family and close family friends and that's why they don't shy away from them. However, when a stranger approaches they don't know how they will react, how they'll treat her, etc. Therefore, it can be very scary to have someone you can't predict come up to you.
It's common. Just ease her into new relationships with people. Start out with kids her own age. Encourage her, but don't push her into being more friendly and less shy with people. She'll come around eventually.
at 11:06 PM on Jun. 22, 2010