<human>: Provide a brief overview of the text.

A very good friend of mine for two years now has divorced parents but has very strong issues with her mother and is always very reluctant to stay with her. She is one week with her dad and one with her mom. 

Mostly, her issues with her mother revolve around the fact that her mother is very controlling of her social life. She forces my friend to give her passwords to all of her social media including Facebook where she browses all of her messages. During the week where she is with her mom, she isn't allowed to have a phone except for an old flip phone with she can only use to call her mother. As well as that, she is not permitted to leave the house for any reason whatsoever unless she is at school, or doing something with her mother.

And, whenever her mother leaves the house, she HAS to go with her. Never allowed to stay home alone. 

The reason all of this is happening mostly is because my friend told me about her mother grounding her a while ago. Since she told me that, her mother has been permanently on her case. 

Her dad is on her side but does not want to get involved - mostly, I believe, because he doesn't know the full story and so doesn't think that it is that severe of a situation. Personally, I think her mother is a narcissist and shouldn't have any authority to do any of this. 

How do I approach this situation? I don't think it's in my best interest to get directly involved unless I want to cause more problems between myself and her mother.
<bot>: Friend's parents are divorced, mom is a privacy-invader and super controlling, dad doesn't want to get involved.