At least I'm sure she had a good long life, and I'm pretty sure there is "cat heaven" (I know there's dog heaven, so I'll make a leap of faith here...how could it be "heaven" otherwise?)!
I think you're right and this verse is why I think that way.
Ecclesiastes 3:19 (King James Version)
19 For that which befalleth the sons of men befalleth beasts; even one thing befalleth them: as the one dieth, so dieth the other; yea, they have all one breath; so that a man hath no preeminence above a beast: for all is vanity.