Amazingly, these drunken lacrosse-playing louts managed to rape this young woman and leave no trace of DNA! In between fending off attackers, she painted her nails and, dead drunk, fell down the steps, (clothing mysteriously undisturbed). The likely explanation for belated claims of rape is to shift the blame...if cops determined she was under the influence of drugs, certainly drunk...she feared she'd lose her children and perhaps any welfare type payments, end up in jail, be kicked out of school, whatever. So be the victim. Voila. Suddenly life is good and Jesse Jackson says he'll pay her school bills. I think your story is the most likely scenario.
Then again, consider: these are guys intelligent enough to get into college without an affirmative-action boost ( I doubt lacross gives a huge athletic scholarship). How drunk would they have to be to come into contact with somebody like that without a durable latex barrier protecting them (and thus no DNA)?