I'm so sorry to read about your mum, I lost my dad in September 2021 to a Brain Tumor. I completely understand and relate to how you feel, my dad was also my best friend my rock and I couldn't imagine life without him. When we were told about my dad I was so frightened, I thought up lots of awful scenarios in my head that could happen. The only way I got through it was to live each day and not think about the future, if I could take a positive out of each day I could get through it. Life is so cruel and I'm really sorry you're going through this. I spent as much time as I could with my dad.  He was also very strong and positive even to the end. All you can do is be there for her like you are, laugh and cry listen to her favourite songs. You'll have to dig deep she will need you to be strong for her. It's just so sad, there are no words to describe the sadness. I send you positive thoughts I hope you have lots of support from family and friends, don't take everything on yourself because you will need support from others Love Sarah