Help! Tenant suing 4 Million for negligence

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I have a tenant who is suing myself and my property manager for claims of negligence and inhabitability. She has played a clever game of never asking us directly for repairs, bringing in code enforcement to cite me and then denying me access to make the repairs despite agreed upon appointments and written notifications. The suit is pretty ridiculous for 2 Million against me and 2 million against my property manager.

I have personal umbrella policy but that only represents me. I'm assuming my property manager will have to get their own legal representation. Any advice or lessons learned on how to handle the situation to stay on the same page with my property manager. We have a good relationship and I want to stay a united front but I know when things get stressful people panic.