My mum thinks a djinn had been attached to my sister

So my mum and my sister have been having a pretty bad relationship for a couple years now but more so like rebellious teen and overbearing mother than anything but recently since last summer it got worse. My sister just acts completely horrible to my mum now even without being provoked, she could be nice giving her food wtv she’d just blow up on her.

Also recently I found out my sister who’s still a teen got pregnant and was planning on running away but unfortunately lost the baby white early on and had also been assaulted around the same time.

I have a good relationship with my mum and would constantly be the mediator between them so when I asked her why she said she’d come to terms with becoming a mother and had loved her child and grew more resentful than usual to my mum for how she treated us in our childhood. Understandable although my mum is making an effort to change, also given her other traumas and hormones or wtv it made sense why she constantly lashed out on us. My sister would only ever ask me for forgiveness and say I’m the only one she has in our family.

My mum had called my aunt a few days ago who lives in south asja and told her about the situation my aunt said she knew an imam/hudjoor who could help. So apparently this guy took my parents names and preformed something over them and spoke to a djinn or spirit and it told him that my sister has been influenced by a djinn that is making her hate her family. In my mums pov it makes sense bc before this the relationship wasn’t as bad and my sister also had quite big fights with me last summer, my mum also doesn’t know about the pregnancy!

I told her it sounds ridiculous and how could a man across the world get all that just from my parents names, he told my mum he prayed some surahs and she should do the same and to get some specific holy water/ zam zam water to put over my sister to get rid of it.

After that my mum said my sisters been acting waaay better and even hugging and telling her where she’s going etc things she would’ve hated and expressed to everyone she would never do due to her “hatred” towards my mum. Even till very recent she would lowkey hate on me for having a good relationship with my mum and tell my mum she’ll be happier when my mum dies.

I was really sceptical and obv thinking is this borderline shirk but if she’s acting different now idk how to explain it, my mum grew up with this sort of thing very prevalent in her life and stories being told so she whole heartedly believes it.

It just seems too crazy that just from someone’s parents name you can have that influence over someone from across the world, and I’ve told my mum about my worries but she still thinks this is why.

Idk if this is shirk or not I know djinns exist and exorcisms but this still seems far fetched. I don’t have many Islamic friends or people who could give me good advice I can’t tell my sister bc she’ll freak out on my mum and I can’t tell my mum about the pregnancy either.

I don’t want my mum to accidentally fall into shirk and go deeper into this or do something bc crazier like use tabeez which someone in my family has before.