The red string doll

I tried everything to pull the string out but I couldn't do it. After crying so much I put on the purple hoodie James got me, all most every single pieces of clothing I have had a a little red string in it, except for the purple hoodie. Even if it felt like that nightmare bed it was better than feeling like blood was on me. And for some weird reason I always feel like I was being watched except for when I weared this purple hoodie. I walked through the park I always hanged out with James. My arm was covered with the selve of the hoodie, I tried to think of the nightmare I had the last night, I continued to walk, I wanted to cry but I couldn't. When I finally got home I saw a note saying we wanted out for dinner, we won't be home until later. A while later I was on the couch watching tv, I didn't want to go to sleep in a empty house, not knowing what could happen this time. As I watched the tv I looked at the red string that's until I got a call, I picked it up thinking it might be my parents or my uncle or aunt, but when I picked it up. It was a dark dark voice "the red string doll" the voice said, I got confused when I was about to say something they hanged up, I got confused so I want to check my stuff animal, it was normal and since my family was out, I want to my little sister's room to look for a red string doll but however hard I tried to look for it, I couldn't find a red string doll or anything close to it, I was confused. What is the red string doll?