<human>: Condense the text into a few key points

My friend is 20 years old and lately her parents have been getting crazy. Her dad somehow always knew where she was or what she was doing without leaving the house. She just found out from her mother that her dad hired a private investigator to track her. The only reason he is doing this is because he doesn't like her boyfriend. He blocked her boyfriends number from her phone and made her quit her job as a waitress where her and I worked together because that's where she met him. He came into the restaurant while she was working and caused a scene pulling her out right there....as she was serving a customer.  Her and her boyfriend send me texts to keep in contact with eachother and I have to go with her when she wants to see him just so she can say she is just hanging out with me and she has to send him pictures of what we are doing as proof. At what point does this become a legal issue? We live in Canada.
<bot>: 20 year old friends dad hired a private investigator to stalk her because he doesn't like her boyfriend. What can she do?