14, going on 25. I am sure you know where I’m coming from. 
I am fully prepared for the possibility that she will have a change of heart at some point in the next four years and decide that a career in MT is not for her. Which would be just fine with me. Better she come to that realization in high school vs. after we drop $150k-$300k on a MT degree.
But given that she is going to (for lack of a better phrase) a “MT immersion” high school, I also want to prepare for the possibility that she will wind up sticking to her guns on this.
As I and others have mentioned, Fall '23 (her ED application/audition season) seems like it’s a long way off, but it’ll go by fast. The last thing I want to have happen is that we reach that point in time and she says, “I wish we had started preparing for all of this a lot earlier…”