After that cutscene, You'll never see Rosie again. As for the second question, you can't marry her since she's only available in that cutscene and after that, she's gone with the wind.:laugh:
''They say truth is the first casualty of war. But who defines what's true? Truth is just a matter of perspective. The duty of every soldier is to protect the innocent, and sometimes that means preserving the lie of good and evil, that war isn't just natural selection played out on a grand scale. The only truth I found is that the world we live in is a giant tinderbox. All it takes...is someone to light the match" - Captain Price
Yup, gone...
First time I've played I though the same thing: she's supposed to make you marry her, back then I ignored her but later I actually wandered where she is.
Actually her appearance after the early childhood is quite irrelevant.
