I'm sorry to hear that. I hope she recovers completely. Can you tell me which cancer does she have and where is it located? Was her arms hurting? Why did you feel the need for an X-ray?
Your x-ray loosely means that there are unusual hardening and thickening of bone, the calcifications and hardening could be due to a number of causes but it's better you discuss this with your current oncologist. We wish her well.