No, it's narrative logic.
This can't be avoided. Any writer would understand that. The "inertia" of a character in a story is not something you can just "avoid". It has to be dealt with with the same force that it was prepared with.
I understand that for a non writer, this principle seems difficult to understand but this is
necessary.
Carrot COULD go back to Zou, but only if she was prepared first. Her coming back after her adventure without preparation makes no sence on a pure storytelling basis.
Again, narratively, Carrot needs a REASON to go back to Zou.
And there is no reason - right now - for Carrot to go back.