Or maybe she's just 24 and wants to have fun. If a friend of mine says "hey I want to do this thing this weekend wanna come?" I don't lock myself away for a week of existential fraughtness and contemplate how doing said thing will affect my career. In fact, about 90% of the choices I make in life are completely unaffected by my career. So, if Emma wants to do a movie because her friends are doing it then WOW COOL GREAT. And then when she wants to work on something serious to "advance her career" (although it can't be easy to advance from being one of the most recognizable people in the world from age 9, but some people have high standards I guess), again WOW COOL GREAT.
Not even my own parents spend as much time analyzing my career trajectory as you spend analyzing Emma's, Jonny. I think it's a generational thing. People my dad's age are ALL about building careers, homes, families. My mom was settled down with two kids at my age. But the world is a lot different now and that's not what those of us in our early-to-mid 20s WANT. There are a lot more options combined with a lot more problems that make becoming an adult right now a pretty complex affair, whether you're a 25 year old web designer or a 24 year old movie actor.