HELP!!! MY CAT JUST SUDDENLY DIED

Hi my name is ej so today 11/22/2018 my cat princess who is a outdoor/indoor was found outside my screen door not moving. I picked her  up and she started seizing i wrapped her in a blanket and held her till she died a hour later. This was so sudden the day before she was bouncing around and she loved to sit on my lap no matter where i was sitting. She was a amazing cat and this sucks. Please someone help me understand what could of happened. Thanks....

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