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Betty Lou's Mommy is the mother of Betty Lou. She appears in a 1994 episode of Sesame Street where it is revealed that she works at a pajama factory.
She also appeared in the 1980 book Show and Tell and the 1984 book Grover Sleeps Over and toilet-trains her daughter in the 1995 book No More Diapers! In the 2001 book Sesame Street School, she picks Betty Lou up from school.