Narnia book question?

when i was younger i'd read the narnia book series, i've seen both the movies that have come out and i recall that susan doesn't return in the last book. i don't have the series any longer and it's been years since i've read them, i seem to recall that she "grows up" and narnia doesn't like her anymore, but the other three kids--along with the other characters introduced in the series all return. i can't remember much more, could someone please tell me what happens to susan that doesn't happen to the other characters because i really can't remember! i also seem to recall that in the end all the characters go to heaven, was susan among them too? or was she exiled or something? please help! it's really driving me insane that i can't remember any of this! :) thanks!