Who knows? The article also says:
Under the National Labor Relations Act, workers are protected from retaliation as long as they work in concert with at least one other employee to try to change their working conditions. However, they can be “permanently replaced” if they strike for purely economic reasons, according to Ken Margolies, a senior associate at the Worker Institute at Cornell University.
So, she *can* be “permanently replaced”.
“The Worker Institute at Cornell University”...what the heck is that?? (just saw that)