My cat dropped dead at 2 years

My prego cat that was 2 was playing on her cat tree with her older daughter at 12pm my son walked out the door and I thought mj snuck out behind him I looked for her until 2am at 3 i found her dead at the bottom of the cat tree she had a horrifying smell And rigor mortis had not even set in yet can someone please tell me what happend she was very healthy and young

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