The main reason she is keeping her savings record is to thumb her nose at her know-it-all brother who thinks she is an idiot for living on her boat, and was extraordinarily extravagant on spending so much money on an appliance.
They are not the greatest of buddies. Her father's will left him in control of her money until she was thirty, because he had some old fashioned ideas that women couldn't handle money and her brother still thinks that he should be able to boss her around.
The fact that she started her own business and has been reasonably successful, has not stopped him from putting an oar in where it is not wanted.
She tells me she knows it is juvenile but she loves to needle him about her successes, especially as he has not done quite as well on his own.