He didn't just say this!
"Oh please. You didn't just play the emotional card!" she said, struggling inside. 'The emotional card' was when someone, usually somebody Lucy cared or liked a lot, asked her 'either you do this or I'll never speak to you again.' Aww, she was sort of used to hear that. For brief seconds she reminded when Lisa played 'the sister card'... Lucy always end up doing what the oldest girl wanted.
"Alright, alright." she answered with a sigh. "Give me that."

Afterall, there's only one thing you can not rum from: yourself. And Lucy certainly wans't different.
Deep down, she was still a true Hufflepuff. Deep down.