sa66, the next few years will be the time of greatest loss of bone because of continuing reduction of estrogen. You may want to consider hormone replacement, especially the estradiol patch.
Calcium levels aren't useful for determining the need for supplementation because your body keeps those levels steady borrowing from the bones prioritizing the brain's need for calcium. On the other hand excess calcium collects in soft tissue and is thought by some to be implicated in athersclerosis and heart valve calcification. I take very little calcium (maybe to my detriment), never more than 250mg at a time and always preceeded by K2 by at least an hour.
I'd recommend 5mg of type 1 collagen, but haven't an opinion on glucosamine.
It's so good that you are saving your bones.