I have always thought we do young people a disservice expecting them to know what career path to take at 16. They are technically not an adult and can't vote but we expect them to have a plan for their life in mind!!!
At this age I think all she needs is A job. One that allows her to pay her way in life, start learning how to manage money, perhaps pay for her first holiday with friends, so long as she enjoys doing it. Use this time to grow in life exeperience and common sense. Hopefully by the time she is approaching her early 20's she will start to figure out what she really wants to do and will have developed some more skills.
I started out as an admin clerk at 16 and in my early 20's went into sales (as a shy teenager that was the last carerr anyone would hav said i would be good at), and i am now a Director of a large sales division.
I advised my two nieces to what i decsribed and they both worked "basic" jobs for a numbe of years. Now one, in her mid 20's has just been promoted (works for the DWP) and the other (23) is working in Dubai and doing really well.
Hobbies is a good place to start, but give her time to develop her sense of self.