How can I help with this please?
A letter to achieve what?
What has she specifically done ?
What action do you want to take?
Being rude to you during a meeting is not a cause of action in law Im afraid.
I'm really sorry but this is not a claim in law.
There is no such thing known to law as beating somebody up emotionally. It is not possible to do. Beating involves the application of force. There has been none.
You can complain if she was rude although I would advise it. All complaining does is create a motivation for people to want to take revenge.
These events do not give rise to a claim in law.
There is no particular reason she cannot ask questions and test your answers with searching questions. That happens all the time with investigators. It is good practice in them to do that.
This might be an unpleasant experience. We all have people we don't like particularly.
It does not give rise to a legal claim.