My working theory is that she gave up a good job because she couldn't get her own way re: childcare and hours. Parents were angry because they got her the job and were also unhappy she was pregnant and chose to become a single mother, so she wanted to prove herself hence hiding poverty, or alternatively, much darker but at this point I think some people will do anything, she wanted to punish parents for not providing exactly what she wanted and needed at exactly the time she wanted. Money, childcare, unwavering support over her decisions etc. So she wanted to punish them.