I'm searching for a fantasy book published before 1993 that deals with 2 characters in a kingdom that get pulled through a portal in the wall to other lands. They have to learn how to work together, and yes, they fall in love.
Young, clumsy female just beginning to learn magic Young prince too busy to remember her name. Shape changing mist that always has green eyes.
Random things: They end up battling each other with magic. He gives her a mirror and puts a spell on her hair so it can't be rebraided.
Any help you have would be much appreciated!