Seriously, who actually gives a shit.
Let's just say for example the future king, any future king, married someone who was rather, errr, dull and not particularly intelligent. But she is very pretty and nice!
But he loves her despite this former shortcomings (no, really?)
So he marries her and she becomes a member of the royal family.
Should someone who is for arguments sake, intellectually challenged or very shy, or a very bad speaker, have to speak at this early stage in her royal life?
Why does it matter if she does or she doesn't and who does it benefit either way? She is not sitting in a guarded room quaffing Moet refusing to interact now is she. That would be unnaceptable.
If she wasn't beautiful and still decided not to speak, would you have started this thread?