The question is making Jane stop and step back. She did not have the power to interrogate the doctor because there is no concrete proof about the crown prince's visit. She really can't refute nor answer him regarding her reason.
"Never mind," Jane is telling him before turning her back. She is walking away from John's question.
"This is our new crown princess. She is coming here and making a problem for us the health provider because she can't find her fiancé. I will put a formal petition to the crown prince's office tomorrow," John is blackmailing her back because she has been rude to his subordinate, and she needs to learn her lesson if Arthur and the palace know her behaviour.
"Do as you wish! Who the hell are you dare to speak like that to me?!" Jane is stopping her step and turned her body to face this doctor.