Oh God being transported into a public Bank wearing a fucking little kids costume Jesus Christ. I feel so bad for this woman.
By the way if she's 30 and the other one is only 10, she's old enough to be her mother. Maybe she is and she forgot?
If she got kicked out at 10 live with her dad anymore maybe she decided to live near her mother sought her out. They both might have a hereditary talent for magical stuff, which is why both of then we're chosen for their respective rules.