She smoked when she was pregnant, resulting in Bernadette's height of only 4'11".
When Bernadette and Howard were discussing their mothers, Bernadette mentions a few things of her mother that drives her crazy:
- Calling her at work or school to find out if she's had a healthy lunch.
- She lays out Bernadette's clothes for her, while not even living with her in the same house.
- Bernadette couldn't ride a bike when she was younger because Mrs. Rostenkowski was afraid she would "hit a bump and lose her virginity".
She ran an illegal daycare center in her basement which Bernadette helped with. Using what she learned she ordered a very tired Sheldon to bed.
She had Bernadette take care of her younger siblings which made Bernadette reluctant to have her own children.