There are a couple of options but she should be healed and functional in a few weeks. The fracture just means she (usually) fell and landed on the outstretched arm. The cortex (like the shell) of the bone on the thumb side (radius) got squashed at the edge of the growth plate and sticks out a little bit. The bone is still in one piece - just a little bit squashed They usually want a repeat xray in a week or so to check healing.