I went through a constructive dismissal case myself.
Unfortunately, I can't give too many details due to the non-disclosure agreement (it was settled out of court)
Basically, I handed in a two page resignation with all of the reasons why I was resigning and stated that because of how I felt, I did not need to give two weeks notice.
I left, contacted the franchise owners, and two weeks later I walked away with a substantial sum. I can tell you, 5 digits for a 16 year old is very very good. The did offer me my job back but I said no and pushed for the compensation.
Anyway, I suggest you get your partner to list and explain everything leading up to the incident, the incident itself, as well as different company policies etc etc.
Then contact the employment relations authority for help with mediation if you want it etc.