[Rivière]

We could go back and forth exploring potential answers to 'why?'. However, it would all be speculation and the only true way of finding out would be to ask her.

I understand the difficulty when a family member has to leave. As you've said, you know she loves you and your sister, so think positively. She's going away but she will be coming back. I know it can be difficult to see the positives in such a situation, especially with your upcoming exams and having to take care of your sister... but see this as a challenge to overcome. One hoop to leap through. Once you've gone through it, it's just another testament of strength. It may not seem like it right now, but in the end, it will be.

Besides, your mum may change her mind and stay, as you've said.