Confused

I invited someone from a dating app over for a second time.

While here she had a medical emergency. I did CPR until EMS came. The worked on her for 20 mins in my bedroom floor and pronounced her dead. I don’t know anyone she knows, no family, no friends, I didn’t even know her last name until they told me. I have no one to tell I’m sorry. No one to see if she spoke highly of me after she came the first time. Everyone left and I was just left sit here. I was told I would get a phone call from the investigator when the file was closed. I don’t know how to feel. I can’t close the loop in my brain of what happened and why. I’m not family so I’m not even allowed to know exactly what happened to her.