It requires you a new hierarchical level
While you can get good results in your responsibilities and tasks, you can witness the arrival of a new management layer that stands between you and your boss (do).
How this situation she says? This may be for a new boss who dread of failing to manager you live (strong autonomy from you with strong ties to the former boss, etc.) to set up an intermediate level at which the task you control would be entrusted. It may also be the will of the new owner to entrust this job to a close will be his direct transmission belt and without any qualms. It can also be for your business, to join the human resources to support new priorities and a new project that, rightly or wrongly, she declined to confide.
Explanations governing the arrival of a new hierarchical level are manifold. It is particularly important to evaluate whether you are able or not to accept the new situation. If the answer is no and suppose you leave the company, because you want to take this occasion to devote to other projects, you will need to gather the necessary arguments to the company does not speculate on resignation on your part, but finds interest in your departure can take place in good conditions.