I wonder if it's one of those membership cards that have her name "Makino Hanabusa" and a number of stamps, one for each time she used the service. (After reaching ten stamps, she gets one free service!)
If it's like that then, with the card in the hands of her mom, she really has no way of talking her way out of this.
« I go to this hotel place to STUDY because I found that the mood is perfect for STUDY since it's calming and relaxing and I get a better return for my STUDY effort so I should be praised for being so dedicated to STUDY hard! Understand, mom? Whaddya mean you're not buying it?? »