Your daughter sounds like a great girl. Any one who has "one really good friend" has a treasure. And the fact that she is liked and accepted by other kids who include her at lunchtime (often the loneliest time for kids who have difficulty fitting in) tells me that she's doing just fine. Your daughter has a close friend, is accepted by others, gets invited to parties and is happy being with her family.  Maybe your worry comes from the fact that when you were her age you were more outgoing than she is. Or maybe you were "shy" and wished you were more outgoing so now, as the parent, you see her shyness as a problem. There is not "problem" here. My best advice is for you to relax. Your daughter has friends and knows how to be a good friend.  Let her know that you have no worries about her and that when it comes to friendship, quality is more important than quantity.