Okay, so she was kind of confused when Donnie told her to meet him in the middle of some random forest, but she trusted him well enough to just follow directions. Eventually, she stumbles across the treehouse and realizes that wow, this is probably the place Donnie was talking about. Climbing up into the interior, she knocks on a door gently before finding him with a telescope. Her eyes light up. "Hey, toothpick." she says, "I haven't seen you since the start of summer."