I'm not expert and could be totally off on this but I have to ask, did they given her a pain medication called Novalgin? It's commonly prescribed for pain like your daughter is experiencing. The active ingredient is called Metamizole. https://en.wikipedia.org/wiki/Metamizole
I only ask because i was given this medication after a surgery in Germany and it caused me very similar symptoms with body sores and complete exhaustion, I didn't know why I wasn't healing as was expected. Eventually I was diagnosed with neutropenia. I could have died from this if the doctor didn't recognize it when he did. The medication is banned in North America and many other countries for this reason but still used widely here in Europe.
I hope it's not the case and your daughter gets well and healthy again soon.