I think Jasper has some redeeming qualities.
And yeah, she did headbutt Steven, and yeah, she's plain mean, and yeah, she insulted fusion. But just keep in mind, when she left the Crystal Gems and Lapis unharmed when she put them in their cells, so she's not that bad.
Her redemption will be longer and harder, but when she does get redeemed she may not join the Crystal Gems but just be allied with them and help out when needed and just hang out with them.
Let's talk about Jasper's redemption!