Light Princess, The by MACDONALD, George

Plenty of princesses have been cursed by wicked witches, but the curse placed on this princess by her evil aunt is an unusual one: it removes all the princesss gravity. What can break the curse before the princess floats away? Perhaps the best thing for her would be to fall in love, but how a person with no gravity can fall in anything is just the problem. (summary by LauraFox)