Why would they make the Bishop a "9" & then just write in it's power that the princess beats it? Why not just make it a 7 & save the extra text?
Because he still beats her during the game(probably because she has been naughty and should repent), but at the end of the game it's still better to court the princess directly than to influence her through Bishop (because she is a strong, independent woman and she will marry who she wants!).
There is a reason that the Bishop is level nine. Its so that a combination of Dowager queen and Princess isn't an insta kill. Its still a bad draw but you have the chance of hitting the bishop and staying in.