According to a couple explanations which I read, it might be that you’ve absorbed certain negativity, and if not released or healed, depression might follow.
Other two, completely opposite interpretations are that if the funerary was for someone else (not self), then it means that you are putting an end to that relationship and you’re closing the past, and in another explanation it means that you will get over a bad situation.
Context is key here.
Every single element from a dream can mean multiple things, depending on the context and I would say that the best is if you could decipher your dreams, since each one of us might have a unique approach to what things might mean for us.
For example, for me, dying in a dream, funerary, priests, black or white and especially white color (yeah, might not be a color, but you get my point), they all are signs of death, or illness (also, anything sexual in my dreams is a sign of illness for me, so women approaching me = bad lol), according to my own observations, but Idk if the symbols or the interpretations are truly common for/to other too.
Again, the best choice would be to take notes or to analyze the dreams, and that only if it’s of any value, otherwise it might be best to just let the dreams pass with the night (or day, for insomniacs like me lol).
Edit: most probable explanation?
You have not let her go yet, in your subconscious, and that’s understandable - that’s why you have such dreams.
You either have not fully processed, accepted, moved on or healed from the trauma and the physical/material separation from your mom, which again, I know how it is…
You might feel a certain guilt, like you did not do enough or why you let her go or something like that…
That’s a possible explanation for the imagery you described too/as well.
Or you just miss her…
And the dreams show us these inner feelings.
Give yourself time and try to release any emotions, use fields and any practices you know to heal yourself, to heal those wounds…
I Wish You All The Best, My Friend and A Pleasant Journey to All Our Departed Ones, wherever they are.
Edit: ho’oponopono, Trataka and Chakras working and occasional Mantras for Deities or/and positive affirmations, these are my ways, you can try anything useful for you.
Also, we never fully forget them, we just learn to adapt to our new reality and we can heal, but they might appear in our dreams even decades later, and they do.
My father did, he hugged me, in a dream, years ago…