She wasn't sure whether or not she needed to practice the wand movement since it was just a gentle tap, but she decided to do so anyways. It would be super embarassing if she managed to mess up a simple tap. She wasn't a first year anymore so more things were expected of her.

She took out her wand and only her wand. She make a gentle tap motion and felt a little silly, but she wanted some house points! She did another gentle tap in mid-air. She was feeling pretty confident at this point and felt like she could tackle the shirt now.