Back in the day, during the dark times of KM, I was almost lynched by rabid fans for suggesting there's something strange about Kiyo's situation. The more specific reason was the chapter where she received pocket money from the Mother for her own use. I questioned the need for it since cooking for the maiko is her job. You know, a job is supposed to come with wages unless your job is being a slave. Yet now we got an irrefutable strong piece of evidence reinforcing my suspicion: She has been working at the boarding house/school for a while now, yet she doesn't have enough money for some pesky souvenir. We are probably talking about the likes of 1000 yen here.
How is that not strange if she was paid like even a cook lacking formal education should be? The boarding house is probably a bloody black business. I reckon Kiyo might actually have a salary, but then the Mother will deduct an equal amount as living expenses. So, she's working for free, practically speaking. You occasionally hear about stuff like this, related to shady restaurants that exploit illegal immigrants, refugees, temporal work visa folks from poor countries, etc.