Yeah, i think she was the one that was least close with the rest of the group. Since disbandment, she's the only one that has never once mentioned anything remotely related to Izone while everyone else has freely interacted with or mentioned their former bandmates. Wizones are wondering where Chaewon has gone, she's literally disappeared, but even she has a photo with her and Minju sleeping over and Yena/Yuri did a whole mini skit about her during Yena's Animal Detective show.
With all her heavy promotions and everyone probably telling her she is the next It Girl, maybe WY thinks she never needed Izone to begin with. I dont blame her for it, she's just a kid, and it's easy to get lulled into complacency and overconfidence. Somi was in a similar position as It Girl and Center of IOI and she literally talked about it during a recent MMTG interview, how she got used to everyone waiting on her hand and foot.
What? Yuri literally said her and wonyoung were hugging eachother backstage during music bank?