I suspect it's more that Ko valued her career enough to not speak up and while i'm crafting Ratts I might as well go for broke and assume Ko may have been agreeing with Zaion behind the scenes (plausible if they were really that close) So when ninji pulled the Blackcorpo bit Zaion found she didin't have the friends in her corner she had assumed.
Rough Timeline
Zaion is being harassed by managment
Ko and Finana are trying to help her and give advice and she gives advice in turn from her indie years
Zaion get's the Axe
Nither of them speak up for her
Finana is a bitch so that tracks
Kotoka Is worried about her career and so fence sits instead of voicing support for Zaion
And now she feels betrayed