I love what @emily1890 said.

Your mom is with you.

If it’s a purely atheistic stand point, we’re all made from stardust and will return to dust, together. There’s part of her in you, in your genes and in who you are, in your beliefs, memories, lens on the world or whatever. Maybe Connect with those parts to honor her.

If you believe in a spirit, then maybe take some time in the quiet so you can feel her spirit with you.