I'm so sorry for the loss. I would recommend listening to your aunt when she needs to talk.
One of the biggest things I noticed is when we lose a loved one or one we cared for such as a client, people are there for you for the first few weeks then they get busy with their life and we are still in mourning. Keep in touch with your aunt, it's so important to be there after the weeks have passed, because whoever is in charge of making arrangements, packing up your grandma's belongings, etc... it is difficult and even into the months, years that go by a song, a phrase,anything might trigger a memory and to have someone to talk to about it is important so they can share it with you.
I also made a collage of photos, then another project I took photos and put them to music on a disc and these are memories that we will have forever.
How I miss my grandpa..