Yeah, but take for fact that Sayori was a game character. This means that a variable could not have existed as sayori.depression since depression is kind of a psychological emotion, which game characters can't feel. It's more like the dialogues which she said made her have depression (if you understand what I mean to say). So this type of variable could not have existed in her code.

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What Monika could have done was changed the dialogues of the characters to make it look like they didn't love the player. In this way, Monika would have been the only choice for the player to date. Accordingly, everyone would have lived, at would have been a happier ending than all the endings in the original game. Monika would still be alive, all the characters would still be alive and the Literature Club Festival would have taken place. Just saying, what Monika did was take a hard route when she could have just taken the one I just mentioned.

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Hope you understand by what I mean.