The bloody key. She fished around for a second in Hannah's coat pocket, and sure enough, there it was. She tried to keep the frustration off her face, seeing as she'd already been made by the elf. No sense in making it worse.
"Oh...Bubbles..." She flashed the key and tried to give her best Hannah smile, which was harder under the watchful eye of a suspicious house elf. "I thought I'd left it at home. I'm sorry. Are they home?"