Confused

So I’m watching The Princess Diaries one and two. In the first movie, Mia is only 15 and by the end of the movie, she’s moving to the palace. In the second movie, she’s 21, graduated high school, and yet…in the first ten minutes of the movie, she asks if she can “explore the palace” and later introduced to her own room in the palace. Where did she stay for seven years?! Um…what? Or am I seriously missing something?

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