J.G.
Okay, this is one test that is actually a piece of cake. She will simply lay on a table as the scanner goes over her and it should take about 10 minutes. The hard part is, she will have to lay very still. That's it! Just make sure she is not wearing any metal that day, like jeans or whatever. They'll tell you all of this before the appointment but really, the test is nothing at all to worry about.
If she's losing calcium, I would think they may just put her on something like the chewable calcium with vitimin D, like Viactiv. For adults, they typically put us on Furosimide (sp?). I'm on both and would know the spelling but I take the generic version.
Take care and I hope all turns out well!
~J.