T.G.
My Brother and I were always shy. I started growing out of it in 9th grade, but was still shy until in my 20's when I felt assure of who I was as a person. Being shy isn't always bad. I am a teacher and I get along with the shy kids because I remember what it was like for me. My daughter is also shy. She is in 5th grade now and finally coming out of her shell a little more.
I think having your daughter do more activities when you are not around. Church Groups, daycare, library and gym daycare is good. I am a preschool teacher and I see so many kids grow when they are in a class without their parents.
I don't know if you talk about her being shy around others, but try not to tell her she is shy or let her hear it. A lot of times when Kids are labled they tried to fit that label they have been given. What really helped me was moving because nobody knew me and I could be anyone I wanted. I wasn't labled as being shy. I know your daughter is young and I wouldn't worry as long as she is getting to do activities with other kids her age. She will gain confidence in herself and become more outgoing.