Bah. Love makes you blind. V probably acted much different in life and letters. In person, she acts quiet and reserved, while in letters she would be emotional and flirtatious. Aandy might get some suspicions when he noticed that V was opening up a bit more to him, but nothing more than the nagging feeling that something wasn't quite right.
Gah, now I want to write a story like this completely in letters! Darn plotbunnies...