If anything she acts older for her age. She's not into the usual dull drinking, going out, flirting with guys who she doesn't even have anything in common with stereotypical young person dross that soaps portray. She's focussed on the family business and is showing a good business head already. Music Karaoke was all her idea. She thought of it, designed, printed & distributed the posters, booked the compare as well as co-presented it. She is showing more ambition than many of the young people in soaps do. Plus it's not the usual stereotypical 'the only way to show that your ambitious is to go to university' that soaps portray either. There's many ways for ambitious young people to get ahead, and you don't need to go to university to run a pub.
I've never known an 11 year old to do all this, so I don't know where people have got that conclusion from either.
When I was her age I much rather stay in, watch a film, write and drink tea as well. In fact, I used to make up excuses in order to stay in when people asked me to come out to visit the local town's tedious night club.
There is nothing wrong with being introverted either. In fact I normally find that they are more interesting than extroverts. Introverts don't need an audience to posterise in front off in order to feel satisfied, they can make up their own entertainment without the need for for the mindless small talk & drivel from others, they are more likely to have something between the ears, they are more likely to be thinkers with a wide range of interests meaning you can have great conversations together, and form a relationship which could develop into something more. And that's another thing, Nancy isn't like Lauren, she doesn't just sleep with people just because she fancies them (although going with Dexter may change my mind).