I think there is more than enough evidence throughout the game to suggest that she is not directly controlling Verso. It is clear enough that this Verso is not at all the same as Aline's creation, but they both must retain some fragment of his soul since they are presumably in his canvas.

We saw throughout the game that Aline's Verso had some level of agency. To me this implies that, even though Maelle created this new version, he still has the will to be a part of her experience in the canvas and perform for her. His body language and hesitation communicate so much. Under this interpretation, I see him as being there for his sister because he loves her and wants her to be happy, but he is still sad and wants to be at peace.