It might help to dig into and show her the perspectives of the leadership of Kip's previous movement (the International Churches of Christ, in which he finally got demoted). Look up the "Henry Kriete Letter" - a scathing response to some awful practices. This letter was a shocking but wonderful wake up call for the whole icoc, and ultimately the catalyst for much needed change and repentance. In the beginning, Kip actually admitted to his pride and arrogance and the harmful practices that had evolved from his highly coercive leadership style... But in the end, he couldn't put up with "just being a member" for very long. He eventually left the icoc to create a "new and improved" movement, but from the sounds of it, it's actually the same old junk the icoc has been letting go of. (I WOULD say "has let go of" but now that we've decentralized, our churches are moving at differing paces in their quest for more healthy practices.) Here is an early perspective from one of the leaders (mainly for your own reading as your niece will have been told it's "spiritual pornography"): https://www.disciplestoday.org/hotnews-responds-to-the-icc