3 y/o is more eloquent with mom, and does better with her learning. Am I the problem?

My daughter turns 3 next month, and she's smart as a whip. Super verbal, quick Learner, understands most anything I tell her. But recently someone noticed that she has more complete sentences around her mom. She seems to do better with her practice workbooks too. Maybe I'm just being paranoid, but could this be something I'm doing wrong? Did anyone else have the same struggle?