If it helps, at this point chronologically Ridley has only fought her twice.
1. Metroid/Zero Mission
2. Metroid Prime
3. Metroid Prime 3: Corruption
4. Super Metroid
I see you conveniently overlooked the Prime games.
Oh, and btw:
Section 0 = Biggest frickin' tease in the entire Metroid franchise.

I have a feeling now that's what the post game content will cover, but man what a letdown. The story's growing on me, though (it's definitely a darker and more interesting direction than Nintendo usually allows)...sort of, even if I think Metroid Fusion makes even
less sense now in terms of the Galactic Federation getting a frickin'
clue ("Even Nedry knew not to mess with the ****ing Raptors!").
I'm also kind of curious given recent events how Samus'
computer can end up as it is in Fusion, as there seems to be certain data no longer available...
EDIT: And uhh...why don't I have Power Bombs yet? There's absolutely no reason why Samus shouldn't have them now.