I certainly agree she no longer fits the description of chaotic evil.However, I don't know if chaotic neutral is the best description either.Her new lore suggests that her destructive tendencies towards Piltover is no longer just about fun, rather an angst towards the apathy and superiority complex Piltovians have towards Zaunites. If anything she appears to be motivated by a very twisted, mad sense of empathy towards Zaunites ironically.
Here are some parts of her lore which reinforce my observations:
A few of the old timers in Zaun remember a young girl who might fit Jinx’s description, but the girl they speak of is a far cry from the one who became Piltover’s bane. This girl was sweet and innocent, a tinkerer with big ideas, who never quite fit in and came to a bad end.
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Jinx sashayed between the wedding guests, keeping her smile fixed and trying not to scream at the dead-eyed people surrounding her. It took an effort of will not to grab each one by the shoulder and try to shake them awake.
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Some even whisper that Jinx isn’t even human, that she is some kind of avenging spirit of mayhem, come to wreak havoc upon Piltover in revenge for the thousands who died when Zaun sank into the earth.
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The wardens attributed her crimes to chem-punk gangs, rounding up dozens of known troublemakers and sending them back down to Zaun. Having others get the credit for her manic schemes didn’t sit well with Jinx, and so she made sure to be seen at every future crime scene.
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Hexlumens fitted with rotating zoetropes and oddly-angled lenses projected spectral dancers onto the floor that pirouetted and spun to the delight of laughing children who’d never known a moment of hunger, pain, or loss.
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Pictures of Piltover’s bigwigs hung on walls paneled with oak and inlaid with geometric copper fretwork. The men and women in the portraits looked down on the people below with haughty disdain. Jinx stuck her tongue out at each and every one of them as she passed, grinning as they tutted and turned away
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Jinx skipped merrily over every bright square as she made her way to a table heaped with enough food to feed a hundred families in Zaun for a month.
After seeing all this I can't help but think she is doing all this because her life was impaired simply because she was born a Zaunite and now lives to wreak havoc on the ones responsible, Pilties. This doesn't exactly strike me as 'Chaotic Neutral'.