In a way, I would like to see more of Jenna. I know many people think her personality is bland, but for me, I think that she could be interesting if she was expanded on further out of two episodes.
If Jenna does return she could potentially interact with both Alex and Maria (those two rabbit characters that rarely have spoken throughout the series). Or other characters outside of the Mr. Ratburn's class is also a likely candidate too. So I could indeed see Jenna make a comeback, but as to what role she would play is something I am not sure of.