@guinivere with your scores, I would not rely on a supplement and absolutely do not do weight lifting.
One other thought: since you are older, your doctor may be thinking 1) of side effects related to other health issues and 2) that you might be able to stay on Prolia for a lifetime (not Fosamax though, which is limited to 3-5 years according to what I have been told).
But a better plan would be a bone builder, to make progress, then Prolia. There is a combo of Forteo or Tymlos with Prolia, which some intersection of the two, on Ben Leder's YouTube video entitled "Combining and Sequential Approaches to Osteoporosis."
Ask your doctor their reasoning and ask if a bone builder is possible.
The issue with Prolia is getting off but the women I know who are the same age as you are taking it for the rest of their lives.
None of us here on the forum are experts with medical training. We are here to offer support and our own experiences, and help you find resources. So always check with a doctor you trust.
I trust my own doctor who I have been with for many many years. But he is a GP altho a GP in a tiny village about 10 miles from my village which is only 1450 population, I know he has many elderly patients as I have seen them in his waiting room! His initial recommendation to me to start was Reclast!
I left a message with the UW doctor saying I could not take Fosomax due to a throat condition I have which was diagnosed years ago which found my esophagus in dreadful shape & led to my going on a diet of only 50% of my usual intake of coffee, chocolate, fruit juice, alcohol,, anythng tomatoey & something else I can't remember. It hasn't been too bad altho decreasing coffee by 50% has not been fun. Anyway, no way could I take Fosomax & I would tell them to check with the Sauk Prairie Hospital if they insisted.