>>715732830She wasn't. Basically, in Japan there are different types of "maid" service. The actual maid, the "maid" that plays it up because women in maid outfits is hot (Kawakami), and then the maids that you fuck. Anytime she talks about "that other service", that is basically her promising to do something, and then referring you to the more expensive girl that actually does the sex shit. Kind of like how hostesses try to get you to buy alcohol.
She was afraid that if things kept going south, she'd have to turn to that last one in order to make ends meet.