Sad to hear that your daughter has lost her passion for the piano. I hope that her love of music allows her to rediscover the wonders of music on the piano as well as the other instruments she is learning. It is a great shame that some teachers forget that the development of knowledge and technical skill within their pupils is not much use without them feeling able to have 'fun' and actually enjoy what they are learning...
I know some very technically able teachers who teach in a very negative way and it horrifies me. If you are truly passionate about the music you are teaching, you will want others to share that wonderful feeling by enabling them to find ways of succeeding and enjoying music, in their own individual way, rather than showing off your own skills to make yourself feel good. That is not teaching in my view.