Oh I'm so very sorry to hear this I would feel exactly the same as you. It is a horrifying thought.

Part of me wishes your T hadn't told you exactly what happened. Maybe this is just me but it might've been less of a blow if details such as it being outside her house weren't mentioned. I appreciate every t relationship is different though and some ts believe in being totally honest with their clients but I know if it were me I'd rather my T didn't tell me everything.

I hope you can take care of yourself through this. It is an awful thing to happen and I understand the world feels unsafe now, but these sort of attacks are still relatively rare in many parts of the world. There are a lot of good people out there. This is very unfortunate. Also remember that T can take care of herself and draw upon her support networks at this time. You don't need to look after her.