Giselle didn't make her choice in anger. She was all set to marry the man of her dreams, than Queen Narissa (disguised as an old hag) led her astray, then snuck up behind her and shoved her down a portal out of the animated fairy-tale world into the live-action real world. More precisely, she ended up next to a manhole cover at Times Square in New York City.
If you haven't seen "Enchanted", I think you should.
