WIBTA If I ask mom to finish the Memory Journal as she got a serious diagnosis?

We got very sad news recently. My (33f) mom (64F) was diagnosed with Stage IV pancreatic cancer. I'm sad, anxious, scared but trying to remain hopeful. We have a great relationship - I became very close when I was pregnant and became a parent myself. She has a beautiful, wonderful relationship with my 3yo son. It breaks my heart that he may lose his Grandma soon and she may not be around to see him grow up or meet any future grandkids.

When my son was born, I got all grandparents these Grandparent journals to complete with info about them/their life. (Like their childhood, their favorite songs, etc - stuff like that.) I was never close with my grandparents at all - I couldn't tell you much about them and I wanted it to be different for my kids. It has been/is different as all 4 grandparents are very involved with my son and have their own special relationship.

I know my mom has other things to worry about right now. I don't want to seem insensitive by asking if she can finish it. I want to remain hopeful for her (Despite me being scared and realistic that she may not have long), and asking may seem like I am expecting her to pass away soon. I also want her to focus on herself right now and do what she wants and would feel bad asking her for anything.

Would it be selfish to ask? WIBTA If I ask right now?