Blessing has died suddenly, on my mother's birthday

As is usually, Blessing was racing around the apartment this morning around 6;30, popped up on the bed to tap the covers by my head, which she knows will wake me up and as I lifted the covers for her to crawl into she bolted away hoping I am awake enough to get up and feed her (she does this a lot). In my drowsy state, I was aware she was really racing around the apartment more than usual, but don't give it too much thought and fell asleep.
I heard her hit the side of my bed (probably trying to jump up again) and got up to see her laying lifeless by the bed-I tried to revive her-her eyes completed dilated and absolutely no heart beat. She had died suddenly from what appears to be a massive heart attack-though with cats the term would be Hypertrophic Cardiomyopathy, which is an undetected-hard to detect hardening of the heart muscle-different than human heart attack. I am in shock today and deeply mourning the loss of my sweet kitty Blessing. She was only 3 years old. She has been a fixture of my blog since I began it exactly 2 years ago yesterday-oftentimes it has been a study of her biography, growing up and observations on her unique calico personality. I will miss her sense of humor-I often thought of her as a jester, even the way she was colored-a mix of white, black and brown, was like a jester's costume.
One example of her sense of humor: yesterday I tried to clip her nails during the day and she was able to sneak under my arm and escape. last night I had the clipper by the bed intending that when she fell asleep in my lap on the bed, I could maybe get them done then. I was talking to Audrey on the phone when Blessing got on the bed late and fell asleep. Later, she woke up and I was still talking to Audrey but I noticed as Blessing got up to leave, she leaned over and tapped the clippers with her paw, as if to say- 'haha-you forgot', then calmly walked away. She often cracked me up like this. She was special, really a Blessing to me and I will miss the life we had. It is also my mother's birthday today and that is also hard to grasp.This is the most recent picture I have of her , which Audrey took when she was here a few weeks ago.