Oh my goodness Silvio, I am so, so
very sorry for your loss.
I have two Persians myself, and I know heart problems are common in the breed... it's one of my biggest fears with my two girls.
I know how horribly difficult this must be for you... thank goodness she went quickly, and had you there with her so she wasn't alone.
Do you have any pictures of her? I bet she was absolutely beautiful. Her personality sounds so much like my two little Persians... they are so sweet, inquisitive, and love belly rubs!