Greets:
Just going to throw this out an yet another attempt to see if anyone remembers it. It's an Apocalyptic setting where the main character, I believe a young female, is undergoing her adulthood trial which consists of climbing a mountain. At the top she discovers aliens living there.
I remember it being a Science Fiction Book Club title as I received it in the same shipment as Nancy Kress' Beggars of Spain so that would put it 1993ish.
It's not Battlefield Earth which usually gets suggested to me when I ask.
Thanks, -drmike