"When a visually impaired mother gets contemptuously betrayed on her daughter?s surgery money, she masters the art of the con to get the money back from the criminal businessman before the daughter ends up with the same eye disease?

Thanks - better.

My thought was a some kind of businessman (banker?)

"When a criminal businessman scams the money she was saving for her daughter?s eye operation, a milquetoast mother becomes a con artist herself to get it back before her daughter goes permanently blind."

When a con artist scams the money she was saving for her daughter's eye operation, a milquetoast mother becomes a con artist herself to get it back before her daughter goes permanently blind.

(I raised the stakes and added a ticking-clock to add urgency to the goal.)