COVID and it variants has disrupted our lives in many ways - in life and in death.
Perhaps the ways we have to do things changes as well? When tradition is no longer (being able to meet together for occasions such as you are writing about) what does that mea in our lives and for the person whose life we remember? Or perhaps the start the new of a new tradition?
I hope you don't mind if I am thinking out loud...
And if a 40 day mass is not allowed, could you have some sort of memorial service at a later date?
In the current situation I would think your aunt would be understanding of the difficulty in having an in-person mass and that would not separate her from (her) God.
I hope you don't mind me asking... how are you feeling about it all? confused? angry? empty? hollow?
For myself, and I am religious, I would feel angry at everyone / everything including God. Another part of me would say my [someone] is now in a better place. I have no understanding of the afterlife, but for me it would be faith (a belief) that carries me forward in relation to that someone vs ....
Hope you are doing ok.