The 20-year-old "Game of Thrones" actress said the "Joy" star also looked after her when she was ill, reported Femalefirst.
"Despite being one of the most famous actresses in the world, she's so down to earth. One day I got sick and she was looking after me, constantly checking up on me, getting me tablets. She was like a big sister," Turner said.
The actress was signed for the new superhero film late last year and she burst into tears as soon as she received the call.
