Well....let's see. What motivates her....
That's hard to figure out. For as long as I can remember, being the older sibling, she always "had to do whatever I was doing". Even now, she does it, without knowing. Mom and I discussed this. When I turned sixteen, I wanted a job. You know, to save money and to buy stuff. What's she do? Complain that she wants a job, and the day she turned sixteen, she hired in where I did.
However.....she's stubborn. She doesn't do something unless she wants to. She can be made to do something, but only by Mom or Dad and she doesn't give in without a good deal of fuss. I'm the opposite -- I do what I'm told, whether I like it or not. I hate conflict.
What excites her.... She seems to look forward to spending time with her friends, and learning the 'latest' among them. Sounds like extroverted behavior, and I think we've got that one already.
The only other things that excite her are....well, she likes animals a lot, and was really excited when we got the new puppy. Although she's not a fan of cleaning up after it and doing all of those "other" jobs. (Mom picks up the slack a *lot* in that department.)