I'd be nervous if I were being prescribed a medication by a doctor I'd never spoken with. Even more if they weren't listed and you can't find out anything about them. How does this happen.
I'd call and request an appointment with the provider you find most suitable from the listing.
I think less experienced providers PCPs, PA and new Endocrinologists are more likely to prescribe Prolia. You need to be thoroughly versed on the risks and carefully followed for adverse effect.
Your sister is having a good experience (so far) which makes it (genetically) probable that you will as well.