Vera (this journal), would definitely know Maria. I think that she personally wouldn't like Maria very much, but she would not let that show and would be polite to her.
Kris, my other royal, is at norgeprins, and he would flirt with Maria because she's female. He'll freeze like a deer in headlights if she sets her sights on him, however.
My other character is a rebel (caniblowitup, so he probably wouldn't know Maria.