While it was good to have someone read her moods, Hermione was still adjusting to having both Draco and Harry picking up on pretty much everything. Ginny and Pansy were one thing. They were girls and she expected them to understand what was being communicated non verbally. Harry on his own was okay, because he always had her back and had managed to navigate a channel between her and Ron to watch over them both after her marriage had irretrievably broken down.