My Daughter, Age 32, Recently And Suddenly Developed Severe Joint

My daughter, age 32, recently and suddenly developed severe joint pain throughout her body. The pain is most severe at night and in the morning and subsides somewhat during the day. The pain is nearly unbearable when she gets out of bed or goes up stairs.

She went to a "prompt care" Monday morning and they said it might be arthritis, which she questioned based on the sudden onset in all joints. They took blood for an arthritis test and said they would call her back later that day with results. The following day, she called and they said it would take more time. She was told to take Motrin for pain. (She is breastfeeding now). Still hasn't heard anything.
She made an appointment with her primary care but that's still several days away. Any ideas?