@Karasu-sama @Ennoch @Matt Ahn
The pout is actually caused by forcing her into taking actions she objects to. Every time you do it her forced action counter goes up by 1. It only decreases by 1 everyday and as long as the counter is above 0 she maintains an unhappy facial expression.
If you have high obedience with low love you likely forced her to go through with a lot of stuff she objected to. So it's gonna take a long while for that counter to 0 out. The forced action counter is a hidden value in the base game. I think the mod adds a UI element that displays it however.