I can say this. The memory of your mom will eventually make you happy rather than sad.
The grandkids in my family held a birthday party every year for my nom. It was basically a family reunion of all the kids she had taken care for. Some not even related. They held it again the year after she died. They had gathered some of her best pictures. They then had them enlarged and put in nice frames. They also put together a slide show that ran throughout the party. It was almost as if she was. there.
At the end the pictures were auctioned off. The money was used for her memory.