At the start of Seelah's turn at the Mountain Peak location, you can either use Crusade or Do the location's survival check. If you decide to do the survival check first and you fail the check, you aren't offered to use Crusade after burying the card. If you succeed the check, you can still use Crusade and there's no issue if you use Crusade before doing the check.
I'm on iOS 10 using an iPhone 6