I was homeschooled from half of first grade on. Sounds to me, your daughter is a lot like I was. Would rahter be in my room studying school work or the Bible or playing the piano. I was very shy. I am way more outgoing now but I have never drank anything alcoholic, smoked anything or anything else people say "kids have to experiment" with. I recently befriended a woman who we have become best friends even though we live in totally different regions and haven't met (she'll find her match through pen pal or the internet). My friend, likewise, never tried anything but also had peer pressure from friends where I really didn't (we also both have heart murmurs which I didn't know I had until after having my daughter so thank goodness I didn't try anything). She was homeschooled, isn't a Christian (so we have a few differences), and likes movies I do not, but for the most part we just totally get each other. So, your daughter isn't the only one like that and when she becomes an adult will have an easier time with the differences she doesn't like in her friends. I some times want to laugh at one of my childhood friends who has many earrings, is learning the drums and has ony wanted to talk about campus life during her college years. In fact, when you are an adult, you got to admit that you come to appreciate differences in relationships or it would be too boring. Your daughter may be one of few, but that is because she is way wiser beyond her years (its a gift and a curse!)
You have no worries with her differences, but she does need you to encourage her to continue to be herself even if that means different than "everyone else" as it is so called. Also note that, if she is like me, she handle way more than most girls her age, so if there is ever an emergency with a sibling while you are away, you can count on her to take care of things (I had to deal with one; my mom came home and freaked out! It involved a lot of blood from a sibling's bloody nose which I cleaned up for my mom without being asked just because that was the thing to do, or at least how I viewed the situaiton.)
Jennifer