I think it's apparent from her behavior that this is is a developing complex.
It was fun to reinvent herself and the city she lived in, and to be popular and rich, ETC.
I don't doubt there was a seed of anxiety from the start, but I I believe she was temporarily satisfied with the world she made at some point, which is why she's so upset with it: She's foisted off the responsibility for her Ennui to Gridman, and no longer entertains any form of conflict resolution that doesn't involve unilaterally demolishing and rebuilding the scenario for her preferences.
I think it's implied that Akane's world is not made from whole cloth, but also that it ran somewhat smoothly for a while. It's only when Gridman caught up with Kerib that the tension started putting cracks into her world.