She was a "party girl" iow a drunken whore. What REALLY happened is she went upstairs at some party with 2 dudes. Instead of being sex godess, they laughed AT her, they ridiculed her, they rejected her.
THAT is the laughter that is seared into her mind.
THAT is why she ran out of the house, leaving her female friend behind.
When counsel asked her what her most prominent memory of that event was, she answered the "laughter"
In the age of "proud sluts" she should just own her past and be a proud slut, not ruin a man who has worked hard his entire life and who is, unlike her, respectable.