This girl invited me to her sweet 16 ?

[Brotherhood]

well first off we've never talked before. i was invited to diffferent small parties and she happened to be close friends with my friends so i saw her there and even there we didnt talk maybe just laughed if i said something funny. even if we both had close mutual friends idk why she would still invite. she hit me up on facebook and told me i was invited and i was happy ad confused a little bit. she said because i know these other girls thats why she invited me. but idk, i mean im a guy. but if i ahd a party i prob wouldnt invite someone i dont know too well. maybe but idk. again we havent directly spoken at the parties and the parties are small ( less than 10 people )