Makes me instantly think of henoch-schonlein purpura.
Check this link out and see if the pictures look like it. She should see a doctor soon to get it diagnosed because if that's what it is, it can cause some issues especially with the kidneys. Let me know what happens. http://en.wikipedia.org/wiki/henoch%e2%80%93sch%c3%b6nlein_purpura.