Well the bf already gave her advise and offered to accompany her but she refused, want to be a rebel. The consequences are hers to face. You don't get a free pass in life just because you have a vagina and can summon tears at will.

Depends on context. Was she drug raped? Was she flirting around, inviting unwanted attention?

There could be reasons why she did not allow him to go, perhaps it's really an all-girl party after all.

Whatever happened there, it's her behaviour and intentions that matter.