I don't know that of course, any more than YOU know she didn't - and I'd love to have seen transcripts of the interchange. That last sentence was meant more in a rhetorical sense anyway; as we all know that "asking for it" can mean other than the utterance of a simple declarative sentence.
Remembering that we almost never get the whole story in the news, to some extent we have to take the facts as presented. Note that both the defendants stated they THOUGHT she was over 18, which I take with a large grain of salt.