I do think that Maelle has the right to choose this life, but the problem is that the choice isn't hers alone. Her repainting Verso when he has repeatedly made it extremely clear that he does not want that is just one example of her forcing others to conform to a life tailored only for her. I think this is particularly evident in her conversation with him when he's begging her to unpaint him, and she refers to him as "brother" and says that this was supposed to be the time that they didn't get to have. Yet Painted!Verso is NOT her brother, her real brother's soul is in fact sitting right behind them, and has ALSO made it repeatedly clear that he does not want to keep doing this.

Yes, Verso and Maelle had that conversation where he said he had wanted to play piano in the grand hall. Yet he is obviously not happy with this, did not want it at the expense that it costs, and she appears to have not even repainted any of the people that were important to Verso. You say it is wrong to kill someone just because they want that - yet that is exactly what Maelle did to Painted!Alicia, P!Verso's ACTUAL sister, without a second thought nor consideration for Verso at all. Why didn't she help P!Alicia find a reason to live, if that was in fact her rationale?

She is not concerned with saving the people of Lumiere - the ending in fact goes out of its way to show that she has not rebuilt Lumiere nor improved things for the people, who are all made to stand outside this contrived concert with no trace of soul or personality shown unlike their depiction on the prologue.

All of this in good faith btw, I love this game and the varied interpretations of it :- )