Hi there @Emmila and thank you for sharing this with us.
I can imagine that most parents would feel the same if they were in your position. I bet you spend the whole day missing your daughter, and to come home and hear her calling someone else mama would hurt.
It's a tough position to be in, given you weren't heard when you tried to have a conversation about it. Family dynamics are so complex, especially when living under the same roof! Of course, you don't want to hurt your mum, which probably makes it nerve-wracking to bring up.
It sounds like setting boundaries is important to you right now, and you have a right to express your concerns and wishes. How do you feel about bringing this up again with your mum?
I thought I'd share some resources with you - Raising Childrens Network has tonnes of great articles on family dynamics, boundaries etc. They are split up to suit the age of your children as well, which I thought might be helpful as our forum supports parents of teenagers.
In saying this, we're happy to listen and support you in any way we can.
