Looking for a musical workshop for 15 year old

Last year, my daughter Colette took part in a musical workshop in Burgundy. Much fun was had by all and at the end of the week they presented a very decent (or rather hilariously indecent) musical. She made lots of friends, which even landed her in a very posh English private school for a week, in an impromptu exchange.

This year, the people that organized are still recovering from last time, so we are looking for something similar. Preferably in English, because Colette is Dutch/French and it allows her to practice. But French is OK as well. Any ideas?