It's my fould....

when I was a young girl, I went out with my grandma for a ride with the bike. My grandmother, she felt, but I didn't do anything. I didn't know what I had to do. My father, he's firefighter, and learned me from when I was young, what to do when somebody hurts him/herself. But I didn't know when my grandmother felt, what to do. 2 months later, the wond was getting worse. My grandmother had cancer. It came from the wond. If I called 112 when my grandmother felt, it won't happend to her. If I called, she won't getting sick, and she didn't die 6 months later.... I will never forgive myself. It's my fould she died. But my parents they don't know. I don't have the courage to tell them. Is there anybody who knows what to do? Please help me!