A genie asked to rescue my mother from a burning building would do it by performing acts that, while miraculous, will be part of a chain of events that is comprehensible by humans. If the genie throws my mother out of the building at 100 miles per hour, for instance, it is miraculous that anyone can throw her out at that speed, but I certainly understand what it means to do that and am able to object. Even if the genie begins by manipulating some quantum energies in a way I can't understand, that's part of a chain of events that leads to throwing, a concept that I do understand.

Yes, it is always possible that there are delayed negative consequences. Suppose it rescues my mother by opening a door and I have no idea that 10 years from now the mayor is going to be saved from an assassin by the door of a burned out wreck being in the closed position and blocking a bullet. But that kind of negative consequence is not unique to genies, and humans go around all their lives doing things with such consequences. Maybe the next time I donate to charity I have to move my arm in such a way that a cell falls in the path of an oncoming cosmic ray, thus giving me cancer 10 years later. As long as the genie isn't actively malicious and just pretending to be clueless, the risk of such things is acceptable for the same reason it's acceptable for non-genie human activities. Furthermore, if the genie is clueless, it won't hide the fact that its plan would kill my mother--indeed, it doesn't even know that it would need to hide that, since it doesn't know that that would overall displease me. So I should be able to figure out that that's its plan by talking to it.