Pretty sure I had that conversation with her prior to the end of Act 2, but I could be misremembering. Even then, we don't have a full understanding of how the Canvas works -- Verso's soul fragment is also a factor here, and while she is able to Paint on it, he seems to be the "source" for it. Given that Sciel's story is also known by Esquie, it's possible Verso's soul retains a "memory" of the characters, beyond just what Maelle perceived. Esquie, as one of Verso's original creations, seems to be an extension of Verso's soul fragment, at least in my mind.
This wouldn't really matter. The originals as well as the "recreations" are still sentient beings with their own thoughts and emotions. The Painters have no right to end their lives. Renoir wants to sacrifice at the very least thousands and thousands of people to save his daughter.
You can take whatever perspective on who was right, but all three characters are acting out of selfishness. Renoir wants to save his daughter, Maelle wants to escape her reality and Painted!Verso wants to end his own suffering and let Verso's soul rest (and, in the process, ideally save his family.) Maelle's solution, while imperfect, at the very least preserves the lives that exist under the Dessendre stewardship, but even she makes the selfish decision to recreate Painted!Verso in order to satisfy her own desires in the end, when she could have let him remain gone.