Lena Dunham and the other writers used Jessa’s honeymoon as the reason for her absence, but perhaps it was actually a stalling technique as they attempted to talk Jemima Kirke off the ledge.
Jemima Kirke’s desire to quit Girls before Season 2 actually makes a great deal of sense when you think about the context of the show.
But when Season 2 picked up, Jessa was noticeably absent for the first episode or so.
It eventually worked, and Jessa has gradually become a larger role in the series.