She was probably too mad at him to let him off the hook, and relented when he behaved and did his chores... sometimes that happens (in Sims as well as in real life)!
My sim did not have the moodlet, which is how I knew it was a glitch, and not just being grounded... Hopefully your sims will become friends again now she's forgiven him

And also hopefully you'll get your game going again, I'm really enjoying it! I love renovation programs on tv, so I'm stoked to see a sims project like that!