I think she's playing hard to get. 
→ 내 생각엔 좀 튕기는 것 같아.

[예문]

A: So, how's it going with Gina?
A: Gina랑은 잘 돼 가?

B: Oh, I don't know. She's giving me mixed signals.        
B: 모르겠어. 걔가 자꾸 날 헷갈리게 하네.   
       
A: I thought she liked you, too.   
A: 걔도 널 좋아하는 줄 알았는데.   

B: I know. I think she's playing hard to get.    
B: 알아. 내 생각엔 좀 튕기는 것 같아.