You got the name of the manager? To really up the ante they need shaming. But this is a narrow edge, chances are the manager reckons she's been bleating to the troops about the decision and prepares her for some more of the same.
Vindictive management only understand one thing, formal complaint in writing, which is then attached to their work file and follows them. Sadly it takes a few sacrificial lambs before either they change their bullying ways or they get managed out for being a toxic operator. They rarely change, and when they feel the chop coming turn the toxic aggro up to eleven to go out with a bang. Hideous pieces of work.
