I have a funeral to go to and I’m stressed about it.

Awkward is as awkward does. Probably everyone knows that your mom passed away a long time ago so I doubt anyone will use the funeral as a time to confront you over why you didn't contact them and if they do just have a canned statement prepared such as " She was very private and I respected her wishes".
Or " I was grieving as I'm sure you are now"
And then just move the topic along. No need to feel awkward or bad. Be bold.
I think like you also then later I almost always meet people who just know how to do and say whatever they want and live without a care and then I realize that I'm overthinking the situation or caring more than that other person would if the roles were reversed.
Good luck and just stop thinking about it.

When some one passed away, the neighbours, work place people, relatives and friends should not wait for an invitation. Every body should be there to say a final good bye. It's actually the culture across the world, like most of Asia and Africa. Even in Russia. Even strangers and by passing( if they have a moment) come to say good bye to decease one and to show compassion to their loved one.
If they know, they should not wait for a invitation. If that's a cultural thing to wait for invite for funerals?

@DoubleRings yes i can understand why you feel awkward but that was you mums final wish and really need respecting irrespective of personal feeling . you are going too this funeral for one and one reason only and that is too pay your final respects too your late uncle. if you are made feel unwelcome as really why should you be as this was not your call and there is a wake there is no need for you too go as you have done what you intended to do

Just say your Mother made her wishes clear and you just ensured you carried them out.

The decision to inform wasn't yours to give

They probably know by now that she died. These things can be found by Google.

Just be all right. You will.

Whatever you do, don't tell the uncle she died.

If you're stressed...imagine your uncle. He's the one that being buried.

Thank you for BA. I hope that you get thru the funeral and have time to connect with family and go thru any grieving that you have without the burden and worry of awkward conversation.💕