You were Joyce’s lost daughter. When you were a toddler, you ran away and Joyce never found you again, it broke her heart but she got over it. She didn’t even tell Will or Jonathan about it..Nobody knows but Hopper.

You don’t remember it anymore either, you found a new family.

Hopper was just doing his job, walking around a park, looking around until he spotted a few girls. He noticed they were smoking but he didn’t care right now. He saw that one girl, the girl was you..you were laughing and smoking with your friends. But Hopper noticed how you looked like Joyce but only a teenager. So he made his way over to you..

“Hey kid, mind if you come with me?” He didn’t want to arrest you or something like that, he just wants to bring you back to your mother..