Wow, that's unreal. Sorry to hear about your tragic losses. My buddy made it out of a lakehouse cabin fire a few months ago but two of his close friends from college did not (one of them was actually a firefighter). He's had a rough time since the tragedy... he's been seeing a therapist for PTSD related issues and it has helped him a lot. It sounds like your wife is already seeing someone about it, which is definitely a good thing.
I just checked all smoke alarms...thanks for the reminder. Everyone reading this, replace your batteries every year and test them every month or so...it could save your life.
My thoughts are with you and your family Chaidan.