It will take time...she needs socialization and security and you need to boost her self confidence.
This is a combo of things: #1 her personality is shy #2 her first 10 weeks of who knows
Ways to boost her confidence is to teach her commands and tricks. With Roxy I started small - "give mommy a kiss" and she comes in close to my face, she may not even touch me, but I tell her good girl and pet her and she really likes this.
And it really is going to take some time....
There are books out there: Help for my shy dog
Roxy is 4.5 y/o and she has come a loooonnnngggg way, but I work with her and keep things simple and I never force her, she has to do some things on her own term
