7 yo prefers to play alone, has no close friends. Anyone want to share their experience? Should I be worried? Any tips?

My 7 yo girl (only child) has pretty much always preferred to play alone and hasn't bonded with any friends at school.When kids at the playground ask her to play she often politely says "no thank you" because prefers to play on her own. She has a great imagination and often has some elaborate solo-game going on with characters and far-away worlds. ;-) Even at small playdates, she often just does her own thing. It's not really shyness, she just prefers to play alone. When she does play with other kids (maybe 15% of the time), she's bold and funny and enthusiastic.Her K teacher last year 1st grade teacher this year were both concerned about it. One teacher just told me that making friends gets harder as they get older so this is the time you really want to try and help them with bond with friends. (Ugh, makes me so worried.)Part of me wants to just accept her for who she is, if that's a solo-playing kid who prefers alone time. But part of me worries that her teachers are right to be concerned and that maybe we need to try and help her.One other thing I'll mention is that I've noticed that sometimes (not always), her desire to play alone has to do with control. Like she'll want to build a marble run at school and finds it much more fun to do it exactly the way she wants rather than have to work with others. But I don't think this is 100% the reason for the whole alone thing.Any experiences? Any advice? Thanks!! via /r/Parenting https://ift.tt/2zYGtrS