I don't want to get too deep in the weeds on this, but what BillMurry is saying is correct about the burden of proof, etc. However, an interesting twist on this (from a legal standpoint) is whether or not there is a civil side statute of limitations for any civil case to be brought against Lamb by her. I assume there is. My understanding, and I am not a criminal defense attorney, is that generally (and this would vary state to state) is that there is no statute of limitations for criminal rape charges to be brought. If I am incorrect there, someone please say so.
If this is correct, she would be on the clock, so to speak, to sue Lamb in a civil matter.
With regard to the lawsuit against UVM, if there is no statute of limitation criminally for rape, Lamb would be able to take the 5th with regard to any testimony he is asked to give (in a deposition or in the trial) for the civil matter against the school, and probably could not be compelled to testify. The reverse of this is what happened in the OJ case. Once he was found not guilty of murder, he could not be prosecuted again, and when the Goldman family sued him civilly afterwards he had no right to plead the 5th as he could not be charged criminally.
Her suit against the school is for the cover up. Therefore is it somewhat irrelevant (for purposes of that lawsuit) whether he committed this heinous act or not, as her telling the school it did happen and their subsequent actions or inactions is the crux of the matter. I would think being able to prove in a civil case he did this bolsters her case, but it probably is not an absolute must-have for her and her legal team.
And to muddy the waters a bit more, I believe the article said Lamb may have committed acts in both Vermont and New York, which each would have their own laws regarding statute of limitations.