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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 potty trains her daughter in the 1995 book No More Diapers! In the 2001 book Sesame Street School, she picks Betty Lou up from school.