I've never had such an issue with a Sim's mood for her career in education. I don't know why. Even when all she had was good moodlets, it still was listed as sad or just above it. I thought maybe it was a glitch in the town I was so tried it in another one and same result. I don't know of any traits of hers that would cause this; she's a bookworm, loves the cold, hopeless romantic, charismatic, computer whiz. I've just never seen it happened. Even with no moodlets, I've never seen the mood go down like that. Anyone have any thoughts on why this might be happening?