During a calm, alert wake window (typically post-nap, well-fed), sit close to Mazzy face-to-face and let her babble first. When she produces a consonant sound — ba, da, ma, ga — mirror it back to her exactly, then pause and wait. See if she responds. Don't flood her with new sounds — stay in her register. If she gives you "babababa," give it back, pause, and see what she does. This is a conversation, not a lesson.