Yes, I can explain that one. There could be many factors playing into this situation. 1) the horse and human are not a good match--if he is the dominant type and she is a passive type, for example. 2) She is not applying the program correctly (which does happen because people sometimes put their own weird spin on things....not good examples of the program by any means), or 3) this horse is too "extreme" for her to handle and she is out of her depth, which kinda goes with #1. Simply because someone "only believes" in Parelli, as you said, does not mean they are a good example of the program. For example, I know some people who live in Illinois and they only do Parelli and they have the potential to be excellent examples of the program BUT basically they are crazy. Weird and wacky spins on things, they think they are Instructors and make people feel like failures and their horses look like robots or they are not confident. Yet they go around showing people what Parelli is (but they aren't really showing what it is) and that bugs me to the point where I don't associate with them. I can't stand them quite honestly. I played with one of their horses before, a supossed Level 3 horse, and he couldn't even stand me swinging the stick around! I mean come on, that should have been taken care of from the very beginning. They're just crazy.
Ok that kind of went into a little bit of a rant, sorry lol. But it holds a valid point.