Of course, she can't ... even Christine Blasey Ford can't!
http://www.breitbart.com/big-government/2018/09/18/feinstein-on-kavanaugh-accuser-fords-allegations-i-cant-say-that-everything-is-truthful/
Senator Susan Collins suggests a good way forward, IMHO ...

The letter proposes not only that Ford appear alongside Kavanaugh, but that both be subject to cross-examination under oath by the other's attorney.
Sounds eminently fair and equitable to me. Give everybody a hearing to make their statements and be questioned - and then vote.