That sign tells me a lot.
Something happened.
She drank too much. She flirted. And the guy doesn’t know he’s a rapist. To me, this adds up to....she wasn’t raped.
But, her boyfriend got mad, spit in her face and called her a slut. Her friends gave her dirty looks and called her trash.
Solution....she simply decided that she had been raped. Because these days, that’s all it takes.
I had the same thoughts as you, but shame and guilt do not equal rape. Plus, this now looks like she is alleging another seperate rape occurred prior to the frat rape described in the Rolling Stone article.