I remember a comic book from the early 1950s. The main character was a girl who would take a pill to reduce her size and then go on adventures with a mouse as her companion. What is the name of the comic book?

Sniffles quickly faded into obscurity in the animation arena. However, he would find new life in the Looney Tunes and Merrie Melodies Comics begun in 1940 by Dell Comics (writer Chase Craig used several minor Warner Bros. characters to fill pages).[6] These comics teamed Sniffles with a little girl named Mary Jane who could shrink herself to mouse size, originally by sprinkling magic sand borrowed from the Sandman.[7] Throughout most of the series, she could shrink just by reciting "First I close my eyes real tight / Then I wish with all my might / Magic words of poof poof piffles / Make me just as small as Sniffles." By now Sniffles had lost most of his animated film personality and was just a companion to Mary Jane as she explored something found in a garden or entered a sort of magical toyland. Mary Jane soon surpassed the mouse in popularity, and she got top billing in later issues. Artist Roger Armstrong drew the series until Al Hubbard took over in the 1950s. These adventures proved a favorite with readers, and the series continued until 1961. This series was recently resurrected for a story in issue #140 of the current Looney Tunes comic book published by DC Comics.