Considering she's kind of introverted and shy i cant imagine her not being a thinker. Based on what you guys have said i think she's pretty sharp, but lacks knowledge in certain areas since she left school at 15 years of age. She definetively has willpower though, so it wouldent surprise me if she has caught up a little to the knowledge she lacked since she left school.
The fact that she lived the dream being a fameous pop star idol and chose to leave it behind to pursue another type of happiness makes me think she has realized what is important to be happy, making her more "street smart" than "book smart".
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