She's in the mines and the dream events are probably one of the better side missions I've made in the game I'd argue, players are rewarded for going out of their way with 3 girls and a bit of lore, if other players don't unlock it they can always just view the girls in the gallery.
The triple jump is supposed to be able to carry the players over the draw bridge, those who experiment and learn they can fly over are rewarded for their efforts. And thank you for finding a typo, I'll have it patched out.