Why she fell for it
When Karolina said her shirt was inside out she was scared did she forget to put it on right. She was happy she and Chase did what they did but she didn't want the others to know because well Chase was Chase he would probably forget all about what they did in the morning and go back to being sweet and kind but also naive Chase.
So when Karolina said that she jumped and pretended she didn't know why her shirt was backward but then it turns out it wasn't backwards and she was good and clear to forget about it.
Later when we went inside he gave me a small look no one but me saw but he looked at me and smiled, and I smiled back.