I also had osteopenia diagnosed some years ago. I do all the normal things of taking Vit D, calcium, walking, and I'm also on HRT, but none of that really helped very much. I ended up being prescribed Fosamax once a week, and that did help considerably. However, for some reason, I decided to stop taking it, and my scans started to get worse again. So I'm back taking the Fosamax once a week. My next scan won't be due for another 12 months so I'm hoping to see some improvement.
The thing with osteopenia is that I think a lot of women probably suffer from it, but don't know because they've never had a BMD test done. Consider yourself fortunate that you do know, and you can take steps to avoid it getting worse.