|When you have a new boss, the job that you enjoyed immensely can be changed immensely. Sometimes such a change is for the better, and sometimes it is like your situation.|
The style that your boss is using went out long ago, and the fact that you refer to her as a boss rather than as a manager or supervisor is revealing. As the word implies, she is bossing you around and showing minimal concern for your ideas or input. Rather than providing any real communication, training, or leadership, she merely indicates that you should consider changing departments.
At this point, you need to meet with her to discuss where all of this is going. If the relationship stays as strained as it is now, it is going to burst, and you are the one who will be hurt. It is time to discuss and agree upon specific performance standards, expectations, and goals.
For the two of you to work productively together, there will be a need for regular two-way communication, goal-setting, guidance, and support. If she continues to boss you around, then you should look around.