Narcissistic Ex-Wife brainwashing and alienating her son

It was mentioned in today’s Q&A call that a person doesn’t trigger you and that many people could have different thoughts about this person or her actions. However, what about in cases when I’m almost positive all people would agree on. Example when it is obvious a mother is brainwashing and alienating her son from her father. This is happening to my partner. Also, if she was mentally diagnosed by a professional, she would be diagnosed with narcissism. My partner is a good father and wants to spend time with his son but she brainwashes her son and makes things very difficult for him.