Her story is so lacking in details, and she can always claim vagueness in her memory. She will never be caught lying.
Yes, someone was telling me that as well, she remains vague so she also can’t be sued for defamation or it will be very difficult to sue her. For example if she gave a specific date and time and address and Kavanaugh produced evidence he was somewhere else at that that exact time, she could have her ass sued off, but by remaining vague she protects herself.