She's testing the hearth of the kid, if he doesn't steal the money she will help him because it will prove that he loves her well enough to not steal from her
Only see bad people in this manga, they just treat the boys well since they love them but anyone else is treated harshly, others characters around the boys are worse anyway, it’s like a pick your poison but the boys don’t know it’s poison that’s helping them
What a pitiful world for them