Well Cirno paying attention did get better at the school but at the moment- Nope. So when she is tackled by the ball of darkness, her first thought is to freak out a little bit. Her lack of cold aura except around her wings slightly would probably be highly noticeable.

But..this was familiar...It took her a moment to remember as she had just gotten that memory back before Rakuen started taking them all away and her eyes widen in recognition and shock. She knew this person and they might actually know her, even thought something about her made her head hurt still. She's going to throw her arms around her in a tight hug because if so, oh dear everything, she missed her friends from home.

"RUMIA! Is it really you? Are you really here?"