What do girls do at sleepovers?

I have asked my girlfriend several times what she does at her friends' sleepovers and she only tells me a little bit. Its driving me nuts. She says she might tell me later or something but now the anticipation is killing me. My girlfriend just turned 17 and I was just wondering if anyone can tell me what happens at sleepovers. My girlfriend seems very content with me struggling for this information and she keeps telling me that there are just some things guys can't know! I'm going crazy! Can someone tell me what really happens? I have heard some guy friends say that they play spin the bottle, truth or dare, strip, play strip poker, or have sex. I think the latter are pretty absurd. Please tell me what is true!
What do girls do at sleepovers?
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