[Why is she not surprised the likes of Kon and Bart had a treehouse for a headquarters?]

Oh, cool. So we'll get to be neighbors.

It's actually a lot better than you'd think. My neighbor and I use our windows to visit each other, since it takes less time to climb over on the branches than to go around the normal way. [Come to think of it, window visitations in general were far more common than the 'normal' way]