不一样的语境会有不一样的意思:will she go shoping tomorrow? _No,she won't. 这里是代表“她不会去购物” 基本上就是代表否定的意思 但 Won't she go shoping tomorrow ?_ No,she won't.中 no 是“是的”的意思,就是“是的,她不会去购物”
Will she come tomorrow? No, she won't. 不,她不会来。(将来时) Will she help me? No, she won't. 不,她不愿意。(愿意:情态动词) She won't come to help me, will she? No, she won't. 是的,她不会(愿意)。(反意问句)