Am I Sinning by Keeping a Singing Doll?

(A question from a young sister)
My aunt lives abroad, and she brought me lots of presents from there. One of them was a doll that sings songs and things like that. I thanked her and told her, “Please don’t bring me things like this next time.” She said, “If you don’t want it, give it to your friend.” I told her I couldn’t, because it could have a bad influence on her—and besides, I’d be sinning too. She laughed and said, “Oh, come on, Mahya!” But, teacher, wouldn’t I be sinning?