She spends the whole "story" (term used loosely) abusing her teleporting powers for fun and profit... even to the point of teleporting an entire mercenary company over from her own world to fight a war for her...
... yet she can't just... teleport the enemy army... 50 miles into the sky? Or maybe 1 mile underground (since apparently she can perform precise teleport-excavation)? Or to the moon? Or even teleport the entire mass of the army into a 2cm cubed space in the middle, effectively telefragging the lot of them? MC is not thinking with portals.