Language B self taught

I think it depends on the school to be honest. I know some schools outsource Latin, for example, be it through an online platform or a tutor. If it’s something your daughter is serious about, I would approach the school and ask about the possibility of them setting it up for her, especially as there are other students keen to do it as well. I think you’d have a greater chance of being successful if you join forces with the parents of the other students interested and approach the school together. My school actually employed a teacher to teach two students Sports Science because it would help with their chosen career and my secondary school would teach theatre on demand so it’s possible. Good luck!