My poor baby girl should evidently be kept away from stairs. She fell down the bottom two last night and injured her ankle. We spent a good four hours visiting medical facilities this morning. The x-rays came up negative for fracture, but positive for massive swelling (which means that a hairline fracture remains possible, actually). Definitely a serious sprain, at this point.
New additions to M's wardrobe include an air splint and a pair of very tall crutches.
Weird facts: the x-ray place was closed today, but the orthopedist is open tomorrow.