She isn't altered by it because IntSys sucks at writing characters reacting like people actually would. Sorry, but there's no way in hell you could do something like that to someone in real life and they'd still like you and want to marry you.
This isn't even about the whole "why can't Soleil S-rank girls" thing (which is pretty dumb, don't get me wrong, but not my main point), this is about a character knowingly giving a drug to someone without their consent. A drug that radically alters their perception of the world, no less. Like even if you refuse to see the ~~ewww social justice~~ side of it, it's just poor writing. It's a shit pairing, frankly.