It's been a few years since my last playthrough, and I can't seem to access the Dragon Castle. Walkthrough is kind of useless on that part. Do I specifically need to use the spell of confinement on Draconic Crusader, or am I missing something?
She might be a late bloomer.
Unfortunately, a hard drive crash and backup failure has left me scrambling around for old copies of my source files, but there shouldn't be a way to lock yourself out of completing the dragon sanctuary.
But if she doesn't come around by the time you're trucking around with your 5th/6th regular party member, then something may well be wrong.