Publication History for Spider Girl according to Wikipedia
Spider-Girl first appeared in a one-shot story in the ongoing series What If. Following positive fan response to the concept, Spider-Girl and two other series (A-Next and J2) set in the same alternate future universe were launched under the MC2 imprint. Although each of these titles were slated to be 12-issue limited series, Spider-Girl's initial sales justified their continuation as ongoing titles.
After initial interest, Spider-Girl drew low sales. However, the book's active fanbase caused Marvel to revoke several cancellation announcements. Reprints of the series in digest size trade paperbacks sold well. Marvel Associate Editor Nick Lowe revealed in a November 2005 interview that "Spider-Girl, for the first time, is completely safe from cancellation."
However, despite Lowe's statement, Marvel announced that #100 would be the title's final issue. Although the Spider-Girl title was indeed canceled, the book was relaunched as The Amazing Spider-Girl, with issue #0 appearing in October 2006.
On October 11, 2008, Tom DeFalco announced that Amazing Spider-Girl will be canceled with issue #30, though he revealed that, due to the company's love of the character, she could possibly be given a sixteen-page back-up strip in Amazing Spider-Man Family. On November 8th 2008, Marvel EIC Joe Quesada confirmed that Spider-Girl would indeed become a feature in the monthly anthology magazine Amazing Spider-Man Family. The series would replace the feature Mr. and Mrs. Spider-Man, written by DeFalco, which served as a prequel series to the Spider-Girl universe.
On March 18, 2009, Marvel announced that Spider-Girl would continue publication as Spectacular Spider-Girl, a web-comic released through Marvel's Digital Comics Unlimited. The title would continue to be simultaneously published in paper form within Amazing Spider-Man Family. Amazing Spider-Man Family #5 (published April 2009) through #8 (July 2009) contained these Spider-Girl stories until the title's cancellation with issue #8.
On July 13, 2009, Marvel announced a new monthly anthology title, Web of Spider-Man, which would continue the Spider-Girl series in each issue.
In February, it was announced that Spider-Girl would star in a 4-issue mini-series, The Spectacular Spider-Girl, due out in May. No word yet as to if Spider-Girl goes back to Web of Spider-Man or gets her own regular series post-Spectacular Spider-Girl.