Siobhan was 17 when she walked out of the Sugababes. Jesy's 31. Siobhan and her bandmates had some learning and growing up to do that should, in this case, theoretically already be done. That's kind of the problem here.
Exactly. This is different from Siobhan, Robbie, and Geri.
She could have easily left or finished the era on good terms and maintained positive relations with the group while having a solo career and leaving the door open for her to return anytime ala Cheryl/Girls Aloud.
She chose a different direction, destroying any goodwill she had with fans, her label & management and of course her bandmates for a Nicki feature that went nowhere & a flop solo career that is over. Nicki moved on, the girls moved on, and the fans moved on. It's at the stage now where she's being phased out of their history and fans are even forgetting she was ever there. That says it all, really.
I can't blame her bandmates if they never wanted to reunite with her again. Unless she takes complete accountability and shows genuine growth and change & stops being a victim 24/7, I doubt they'd ever be interested and quite honestly, after enjoying the last year of the trio, they're more than fine without her.