The title indicates my question, but let me explain you the situation a little bit:
So, there is I girl I know who happens to be my friend's sister (I will call him friend #1). Yea I know that most of you will say this is a no-go but this is my live and I would never ever hurt my friends families so please no comments. Please read this as if it was a random girl.
I have a really close friend (friend #2) who once told me look at friend #1's sister, she is so hot and she clearly wants me (he was kind of joking). Eventally I met her too and added her on facebook (pretty standard for me). Then, she kept throwing IOI like crazy : Always smiling, joking, Initiating conversations on FB, asking questions out of the blue, reinitiating conversations every single time I stopped it, messaging me stupid stuff with her brother's account, asking me my phone number and later texting me out of nowhere when she got her own cellphone. I probably forgot a lot of IOIs but, as you see, there are many of them.
My friend (friend #2) told me that she does quite the same with him (which sounds highly unlikely due to the high number of IOIs but anyways). So I'm wondering if she is just trying to be "one of the boys" or, if you like, she wants to be in the gang.
P.S. she most likely acts like this only with me and probably with friend #2 also.