I take a vitamin d2 125 mg 50, 000 iu once a month along with calcium supplements 1, 000 mg a day , is this enough to treat osteopenia ?

Depends: It depends on if the vit d that you took corrected you vit d level to normal - it also depends on if you are taking the calcium properly (with food, and divided throughout the day). You want to have your vit d level rechecked to make sure you're fully in the normal range and take more if needed. Finally weight-bearing exercise (like walking) is vital to helping prevent/treat osteoporosis.

Not likely: First, this will only help if you were deficient in vitamin d and/or calcium. You will need a balanced diet to put the calcium in your bone. Exercise is also essential for osteopenia and osteoporosis; for the spine read the book 'strong women, strong bones'. Last, vit d2 isn't as good as d3 see http://summaries.Cochrane.Org/cd007470/vitamin-d-supplementation-for-prevention-of-mortality-in-adults.