Vance is not so much against unions as he is opposed to economic globalization policies that have encouraged off shore manufacturing and social poverty programs that fail to support people to improve their abilities to provide for themselves, at lesst this is what I have gleaned. Admittedly, I am not JD Vance expert.
It is possible she has made the same resolution and is helping him by holding him accountable to his commitment. She could have done it on a more encouraging way.
Pushing the limit with that one.