The Pod
From Jenny Everywhere Wiki
According to a partially-unreliable comic book purporting to tell Jenny Everywhere's origin story, the Pod was an experimental dimensional transport created by Jenny's mother and father to allow their daughter to escape the destruction of their universe by the Living Black Hole. Although successful in that, the machine had an unintended side-effect: splintering Jenny across the Multiverse as it literally sent her "everywhere" at once. (COMIC: The Secret Origin of Jenny Everywhere)
One version of Jenny got a glimpse of what sounded like this version of her origin while suffering from shifter hangover, commenting on how curiously similar it was to Superman's origin. (PROSE: Morning After)