Does my mum practice sihr?

Assalamu alaikum. I wanted some thoughts about my mum's past and what she's doing now. From when I was little she would boil one big pot of water, throw a bit of burnt paper in, and let it simmer for hours. She also reads duas over water and sprinkles it around the house and on us. I know that can be ruqyah for protection, but because she did it so obsessively - especially while my dad was preparing to divorce her and she feared we'd side with him - it felt off to me. She had a conflict with some relatives from my dad's side and started that pot-boiling again for a week straight. After one phone call she began laughing and saying things like "did you see my power... I did it... it put her in her place... she got a heart attack because she humiliated me." (It sounds worse in our language and doesn't translate well.) To me that sounded like an admission to using sihr to harm someone, but I'm not sure. Is that possible? We've also had a lot of strange things in the house that we think are jinn - footsteps in the corridor, and on a few nights my sister heard a jinn walk down the passage and go into my mum's room; my mum would scream in her sleep and say someone was hitting her. Could this be the effect of sihr, or is someone targeting her too? Any advice on how to understand or deal with this from an Islamic perspective would be appreciated.