Funny how girls don't like to be raped and tortured by strangers... :-)
Buy her some clothes and have her wear them, take her out for walks, dinner, movies etc. give her a good job or use her as a hunter and her happiness and affection should go up.
Rescuing her friends from prison will also help happiness and affection.
Lowering her Willpower does not really work well with Aria. It can be done but requires a good understanding for the game rules. Also note if you plan on installing her as Chancellor you need to keep her Willpower high 80+