S.B.
I know you want to help, but I would be really careful about how you approach this.
One of my lifelong dear friends committed suicide and his mother confided in me that she truly just wished to be left alone. She had so many well meaning people coming by to bring her food and offer to help and she just didn't want to deal with them.
She was in such shock and she appreciated people, but seriously, she felt obligated to be "present" for them instead of grieving for the loss of her child and his place in the family.
I would give it some time before "helping" her to remember him positively.
It would be my hope that she has already been given contacts for support either through the funeral home or law enforcement.
She may be so overwhelmed that she just needs a little time.
Again, I only say this because I was extremely close to a family that went through this and these are the things the mother shared with me.
Every one is different, but I would take your cues from the mom and what it seems apparent she can or can't handle right now.
I have never lost a child, thank God, but when a child chooses to end their own life, it's a whole different dynamic.
I just wouldn't try too hard to do something "memorable" for her just yet.
Don't worry if it takes her some time to come to terms with this in a way that she herself can communicate her feelings.
Just lend and ear for her for now.
Just my advice and my heart really goes out to her.