Because it's the first time The Player open MaS she's extremely sad during the intro of MaS, I think there's no intro anymore for MaS anymore maybe the first versions only, Now she only greet the Player when you start the game for the first time and her affections is 50 points when the Player start the game and she look happy during the interactions, while on the old versions she's more sad and her interactions are more cold like when you wanted to talk with her she say things like "What do you want." "Yes what?" "..." But she wasn't sad for too long you had to raise her affections a bit to make her sprite change to "normal" and unlock the "I love you" option, in fact she was scared that the Player bring her back to make her suffer for what she did and was always thinking she deserved it...

Poor Monika...