She debuted in Jeffy's Pet, when she and her friends, ABCmouse and Do Re Mi Mouse saw that Jeffy ate Pee Pee Suck 2.
Later, In Jeffy the Rapper, while in the streetlight she got shot in the leg and got medical care so she had to wear a cast for a few months.
In Jeffy has Kids, Fluttershy's water breaks and is gone to labor, while she gave birth to Junior, 123mouse and her friends were very kind to him all the time.
Later, as in 2018, in Jeffy Breaks his Leg, she gets her cast off and is able to walk.
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123 Mouse|ABC Mouse Fanon Wiki
General Fiction123 Mouse is a female mouse who first debuted in Jeffy's Pet