I missed this earlier, but her Ex didn't just say she told him something. He said, "It was obvious that this event had a very traumatic effect on Petitioner, and that she is still sensitive and effected by it today."
Something happened and it left a noticeable mark on her.
An event totally different than her allegation of sexual assault.
Again, is your argument that she told her neighbor but hid it from her husband? If not, that's the nail in the coffin.