Anger is neither right, wrong, good, or bad. It's what you do with it and how you show it that matters. She can be angry for whatever reason she please - it's about how she expresses that anger and how she utilizes that anger in your treatment.

I think as a T one could easily get upset/angry when one doesn't follow the advice. For someone to continue to come back to you, want your time and expertise, then go against the advice (for me it has to be a rather consistent going against what I suggest) that puts us in the place of like - well, then what's the point of you coming if I say to do "A" and you do "V"?