It seems to be something personal or something with her family that no amount of Phase success would change. In the fishman interview the question "What steps will you the Phase Army take to finally liberate Chisaka Airi from the clutches of the evil Black Company Nation???" was asked.
F - Fishman, A - Airi
F: "Dude I told you this, just come to Canada everything will be solved when you just come to Canada."
Airi: "Dude but when I come to Canad... dude that that in itself causes issues for me though... I can't - I can't come to Canada... maybe one day... maybe one day..."
F: "No you give them too much power man, you gotta - you gotta fight back!"
A: "It's not - it's not like I have a choice though, you already know, you guys all already know, everybody at Phase Connect knows about my situation"
Timestamped interview: