Since you have not mentioned what pill she took, I can only say that arthralgias can be seen as a side effect when there are associated hormonal
disorders. The best way to know why this happened would be to see an orthopedic and get some blood tests. She may be advised some analgesic
and antibiotics if needed. Please note that it is not normal to have such pain as a routine after an abortion; it definitely needs to be checked. Take care.