I'm guessing that she's too generous (towards the kids, especially) or frugal for her own good, as a result of her past lifestyle.
Hello?!? Mika-chan? What's wrong...!?Um, well,Aaaah...
I'll be right there, just wait a bit longer, okay?*Sniffle...*Uu...*Hic*Everyone please put your hands together, and-Itadakimasu!Aww, I want some!Itadakiiimaaaasu!Sensei, aren't you going to eat?Chiyomi has omelet rolls today!I ate lots this morning so I'm not hungry. You kids eat and keep it down, okay?Okaaaay~*Growl...*Hm? A call from the kindergarten?*Beep**Bap*Sensei?*Boop**Vrrrr...*
*Vrrrr...*There's trouble.Mika misses you and wants to cry, so hurry back.