Simple but touching
As you said, a 60 second project, so... clearly it can't be a novel. I really liked the motif of returning to her grave as the seasons change and replacing the flower with a new one.
Again... really simple. But sometimes the best things are. Well done job on a bittersweet flash.
And I'm sorry for your loss. Lost a few people in my life, mostly older relatives whose time had come but also my best friend when he and I were 12 (to a drunk driver). Your aunt was also quite young... 39? If you don't mind saying so, how did she die so soon?