It must be very sad grieving your mum. This is said with the best of intentions to avoid you making perhaps a mistake.
Funeral etiquette can vary a lot in different families, and people's expectations differ greatly.
My best friend from school expected me to travel 300 miles midweek for her dad's funeral. I literally couldn't, I had "mission critical" meetings at work I couldn't miss, plus two small children at school/childminders. I simply couldn't get there.
She then reacted by doing a savage character assassination of me as a person, then didn't speak to me for over a year.
To be honest it had never even occurred to me that I would go. Ive never thought much about funerals, I've avoided them mostly, unless escorted there against my will.
Then when my own dad's funeral came, I found it completely unnecessary that people came. My in laws came a long distance. Said friend came. I appreciated the gesture, but in all honesty, it forced me to have to socialise on one of the hardest days of my life. Really all I wanted to do was privately grieve. I guess potentially it distracted me. Dunno.
This is all shared just to illustrate how different people feel about it.