Rpg maker Xp HELP with event?

I'm working on sort of a quest cut scene in which the player enters the castle and talks to the king, after talking to the king the kings daughter is supposed to walk up to the player say some stuff, teleport, and then the event should go away, However, when i did all of that it worked but if you re entered the castle after that she would reappear and approach the character and all of the same events happen again. I dont know how to code the event i wrote.