There are people who has suffered PTSD and will have mental condition where their brain will paint a different scenario to subconsciously escape from the problem. And there is no way you can tell whether a lady has been sexually assaulted before.
Or do you actually go around asking your female colleagues whether they have been sexually assaulted before?
You anyhow use the word siao lang on her. Her father can sue you. Good luck.
Lastly, she dunno what the word "substantiate means" when she submitted her speech late. This infers she could have some issues understanding instructions whenever it is related to the anecdote lie. Hence, why can't people infer that she also cannot understand what PS told her about the meeting on 03 oct?