I think it has to do with the fact that when we first see her in Warp Tour, the Crystal Gems don't know how anything about her or how much of a threat she is. It's only until later that we find out that she practically treats her mission on Earth like a day job that goes south very quickly and while she does bring in pretty dangerous reinforcements (the ship, Jasper) in the end she's rather inaffectual on her own.

Needs more Jack Spicer.