I am so sorry for your loss, Retro. However much you may think you didn't say it enough, you made it clear on the time you spent with her. She knew.
Where myself, I was a fool. My mother passed in 2007, I still miss her everyday. She was in remission of breast cancer for 14 years and then it returned to her throat, then it went to her bone and finally to her liver. She wanted to do a get-away weekend and I kept putting it off because I kept saying we'd have time. It was part trying to convince myself she would get past this, get better and we would have 30 years still. We never did get that get-away weekend, and I regret it to this day. I was in denial. And as I said, I was a fool.
You showed your mom how much she was loved by every movie you watched, every minute you spent together. She knew. And besides all of that, she knew. For how much of a idiot I was, my mom still knew I loved her immensely.
My deepest condolences.