Is this normal? Vocal coach critique

[u/Cultural-Echidna-312]

I’ve been seeing a vocal coach for a little over a year. I sing in a community choir and also do some
Open mics around town, so nothing too serious. Sometimes when I practice a song in front of her, usually when I am playing guitar at the same time, she seems to focus on my facial expressions and jaw movements more than my sound. She seems turned off by the way my jaw moves when enunciating certain words and has told me to record myself so I can see what I look like. I’m trying to be open to all feedback but sometimes it just seems mean, not to mention unnecessary since I’m more concerned about how I sound, not how I look when I play. Should I just take it on the chin or does anyone else think it’s a strange thing for her to focus on?
For the record, I did do a video recording of a song and I didn’t see anything crazy with my face or jaw movements 🤷🏻‍♀️