Apparently we have ourselves a little climber. She must have stepped on top of the space heater, and then climbed up on top of the diaper box. She still wasn't tall enough to get into the crib though.
Just a few moments later, she emerged from her tent, having developed this new patellar tendon device. Take a hair scrunchy, and add a few q-tips for extra stability on the tendon. Maybe she injured her knee climbing. :-)