No rough play at all. Even if it seems like your just playing and having fun, Bella won't know that and she will think that she can scratch, claw and bite whenever she wants.

If she ever hurts you, you need to get out the spray bottle. If one spray doesn't work try two or three so it will get through to her that hurting you is a "no-no." Try saying "no." Say it sternly, but not yelling. You are the boss of Bella. You need to show her that.

Good luck!