yeah it's just as i feared. she's resigned to her fate but little moments like that and then getting your hopes crushed again and again. take Souta out of the picture and i'm sure she'd jump off a roof since there'd be no point to her life anymore. any suspicions of whether or not she actually liked her job are gone. she hates it, men and money.
if i were to guess, she probably got pregnant in high school, guy that got her pregnant ran off and her parents disowned her. since she probably dropped out of high school she can't get any good jobs so she had no choice but to rely on her looks despite absolutely hating it. i'm sure she really does love her son, but is letting her scarred emotions get the better of her.