In Earthlings, Jasper become corrupted after fusing with a corrupted gem. Steven tries to help her but she refuses and end up becoming a corrupted gem before get Poofed by Peridot
For me, She is the least-developed Gem because all she do was being angry a lot.
Of course you don't want her to be redeemed but it will happens since Rebecca Sugar say there's no Villain in SU.
I think the reason of why Jasper is so angry because I think she put hard on herself and doesn't want to be see as weak. If this theory is true, I going to blame this on Holly Blue Agate because she made Jasper through HELL! It will explained of her behavior
Jasper is the difficult one for Steven since she blame Rose for killing Pink Diamond.
If Jasper going to have a redemption arc, I think she should stay as a Corrupted gem because it's a punishment for her bad deeds. She will act like a pet to them until she will realize of what she was a jerk to everyone.