I of course can't answer the question of whether your daughter is unhappy with you. Sometimes stealing is a symptom of the emotional relationship of the parties involved, but it is not necessarily indicative of this. Just as often, stealing is a reflection of lack of impulse ccontrol in children who
simplySimply sleep want something - they operate on the pleasure principle. You are managing things in an appropriate fashion. That is, you are setting a limit and providing sensible consequences. I'd place a definite time limit on the punishment, rather than keeping it open-ended, and I'd include a component by which your daughter 'makes up' for the wrongdoing by doing something to help her grandmother.