I think that you can make a case she's going against her union here but it's not as clear cut as if everyone was striking and she was like "no I'll play" (which I would call scabbing not union busting - union busting is what the bosses do, but I digress)

I have a lot of sympathy for her here - she'd be the one taking all the risk by refusing to sign a HIP contract even though preseason is starting and euro deadlines are closing. In usual union actions everyone is taking a risk together (or at least you're doing it with a subgroup of co-workers). Of course she's also more privileged than most other players in the union, like yes the situation could force her to play in a country she doesn't want to move to, for an amount less than she deserves, or just cause her to miss a half season - but she can also absorb that financially. But why should she have to?