It’s also not abnormal at all for the head trainer to desifnate some lessons, rides, and various tasks to their assistant trainers. It’s possible to ride with the main trainer, say, once a week, and have the assistant or even working student do the stuff inbetween with the client and/or their horse. Perhaps MB was not clear about this and LK had other expectations re the training program and there was a communication breakdown.
Some people also want to train with the “big name” only for status reasons. Or perhaps it doesn’t work with the assistants. Then they need to speak with the head trainer and decide if this program/training style works for them. If not, best to go elsewhere or just do the occasional clinic with the BNT/head trainer.
I don’t know what the exact beef was, but it seemed like LK was under the impression that she’d exclusively train with MB. That turned out not to he the case, and she simply didn’t like that or didn’t feel that’s what she was paying for…and neither of the parties involved seem to be experts at communication or dispute resolution.