How did my cat die ? :S?

My next door neighbour knocked on my door this afternoon and had told us our 10 year old cat had died, she was a very well treated cat and an indoor cat, wed let her roam around of a day time but she never went any further than our next door neighbors and maybe the ones behind as well
she had slobber marks on her or like wetness but on her bottom and around her ear and stomach, she had dirt in her mouth her tongue was stuck out and she was sort of laying awkwardly.
there was no blood, and no bit marks, just the signs of like wetness but no vomit or any sign of an sort of substance around her anywhere i looked everywhere even like in my yard and the front and the neighbors i dint understand what it could have been ? i saw her an hour before and she was fine being her fat lazy self, we cant get a autopsy its to expensive but does anyone have any idea of what it would've been ?
thanks
 
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