[Pen] Ouch! A horrid situation however it pans out. It's too long since I was a union convenor and kept up with employment law, but make sure you follow all the procedures properly yourself such as following up internal channels even if you know in advance it won't make any difference. You should also keep records of everything, including as verbatim as possible notes of conversations. Best of luck.
I'm not familiar with the term "Constructive Dismissal" so I looked it up. Am I to understand penelope is being harrassed by her supervisors to the point she will quit?
Regardless, please add my best wishes that things resolve well for you, penelope.