100%! OP, I’ve had horses that went barefoot. Guess who trimmes them? The farrier who took care of the shoes for the rest of my crew.
Most of the folks I see advertising themselves as barefoot trimmers don’t shoe because they didn’t go to shoeing school. While shoeing school doesn’t always guarantee a great farrier, at least they received some quantifiable education and passed some sort of test to graduate and often apprenticed. You have neither with a trimmer who doesn’t have a formal education.
eta: You really need to be present for any foot work on this poor horse. Not your husband. Not other boarders. You. Beacause she is not receiving adequate care in this area without you.