She didn't earn it by working for it, all she did was lie and tried to cheat Koki and her son in law felt sorry for her, that is why he offered the money and even he lied to his mom for the money.
I am glad Urmila didn't get the money and Rashi had to pay the parlor bill with it.
Once again a poetic justice.
Another point Urmila keeps saying "hai mara thakorji" but continues with her bad deeds right in front of his eyes. Then she goes on to say Kanaji is testing us, well I would have to agree with her on this, he is testing them to see how low can they stoop. And not to reward them but to punish them.
I hope both Urmila and Rashi both get what they deserve soon.