I am delighted to see a Protestant make an argument from tradition.
I do not dispute that she did. I dispute that the question in Luke 1:34 is reflective of that hope. I think it is reflective of her intention to remain a virgin and not have sexual relations with Joseph.
If she expected to consummate her marriage in the sexual way, the natural response to the Annunciation in 1:31-33 would be either:
-- Looking forward to it. I am getting married, you know. Can't wait to tell Joseph my fiancee. (if unaware of Isaiah being fulfilled in her)or, if the connection to Isaiah's prophecy clear in her mind:
-- How am I to remain a virgin if I am betrothed to Joseph?
Instead she sees her virginality -- not her betrothal -- as inconsistent with the Annunciation.
If The Plan of Salvation is tradition. Salvation is of the Jews ( John 4:22)