Oh @XenoBitch that's so hard to navigate the first few days without support. I think you would probably feel better with your mum.
I'm from a Northern Irish family, and the funerals happen far sooner there. Traditionally 3 days, but in my Dad's case, as my siblings and I all had to travel over from GB they gave us 6 days. So, I had to rush over asap, and then it was all hands on deck planning the funeral. It was very important for me to be there, and being at my parents' house, seeing my Dad's empty chair etc was heartbreaking, but also gave me several days to intensely grieve before and after the funeral.
I think it's really unfair in England that people almost have to put their grief on hold for weeks sometimes due to very delayed funerals. The Irish way is kinder and more human I think - friends and relatives bring round cakes and comfort etc on the run up to the funeral, they wouldn't let you be alone!
So, my heart goes out to you that you're dealing with this alone, and I hope you can get some more support from family and friends. Could you just tell your mum you'd like to be there? She'd probably value the support once you arrive.
It's good you've got this thread in the meantime. So, you're not alone in that sense. You take care x