Conflict of doctor opinions Forteo vs calcium medications

My mom was diagnosed with severe osteoporosis 7 months back. She is 67 years old and is in India. The doctor (Doctor 1) advised her to take forteo. Since this is the first osteoporosis medication she has taken it is difficult to know if this medication is effective or not. Few months later she had frozen shoulder and was operated with Key hole surgery to treat the frozen shoulder. This surgery was done by a shoulder specialist (Doctor 2). She was referred to this doctor by Doctor 1. The shoulder specialist now says to stop Forteo and continue with continue with the calcium and Vitamin D medications as in his opinion Forteo is useless where as doctor 1 says that we should continue treatment for 1 year and then stop. My mom is completely confused as what to do. Can anybody please give their thoughts to me.