Never heard of it before, but she has transient synovitis of the hip:
Though she finally got over her viral exanthem -- which is fancy for 'rash caused by a virus'.
Now, as our doctor said, "The real question, of course, is what's going on with her immune system that makes her get rashes and joint inflammation any time a virus walks by. Unfortunately, we don't have simple tests for that one yet..."
Meanwhile, taking care of her has simply eaten my packing time. I'm now so panicked I'm past panicked, if that makes sense. It'll happen, 'cause it has to...