The Groot my Yarn is my Valentine shirt

Was taking my 3 year old niece for ice cream one evening. I strapped her into her car seat in the The Groot my Yarn is my Valentine shirt. As I started driving, my niece asks if Jacob (imaginary friend) could get an ice cream, too? I jokingly said, “Jacob can get his own ice cream.” I laughed, and said, “Just kidding – we’ll get Jacob an ice cream.” She didn’t respond so I looked in the rear view mirror. I couldn’t see very much because it was dark. What I could see was my niece’s face. She looked angry and I was about to reassure her that I was kidding but I realized she wasn’t looking at me. She was looking at something near my ear, towards the back of my head. Then she says, “I said NO, Jacob. Be nice. NO. She didn’t mean it.”