My mother is 60 years old.she did dexa scan.tscore of lumbar spine- 2.6 , left wrist -1.8.what treatment should she take in addition to ca and vitamind?

Osteoporosis: Osteoporosis treatments include the “basic cde’s” -- calcium(c), vitamin d (d), weight-bearing exercise (e), prevention of falls (f), and bone-friendly medicines.

First one has to see: Why she has osteoporosis. Is it just related to age or issue related to systemic disease like thyroid or environmental like smoking or a combination including poor nutrition. She needs a medical evaluation and then based on her medical condition there are a variety of options up to and including options like reclast, (zoledronic acid) Prolia and forteo.