My cat passed away in the worst way

I’m writing here in hopes that somebody else can help me navigate this. I found my Kitty on the on the grass in front of my house passed away. I don’t know how she died. All I know is that I found her and it’s been the most horrible experience because she was only 11 years old. How do you deal with this? Has anyone ever experienced this before? She was mostly an indoor cat but got out frequent. I’m broken.