Bella smiled, leaning in and kissing the girl gently. Just a peck. "Good girl," she said. "That's pleasing me."
She turned once more to stand behind Lily, holding out her wand and aiming it at the creature. "Repeat my movement," she said, showing her the flick of the wrist just so. "Avada Kedavra," she then said, and the gnome was dead, just hanging in mid air until she let him fall.
"Tomorrow, you will start practising it," she said with a smirk. "Today, I think you've had enough practise. At least before lunch." She would step up the training later, but she had a lot of other things to handle.
"Let the elf take you up to your rooms. If you are good perhaps you can take a stroll in the garden later." Under supervision of course. "After lunch we'll continue with Legilimency and Occlemency."