Daughter doesn't say "mama", calls everyone else, constantly babbles, …

Daughter doesn't say "mama", calls everyone else, constantly babbles, but as soon as I ask her to say mama she starts blushing, and when I'm not around she doesn't say mama either, like it's important to her. Although I noticed that she only meows from the letters "m" when showing a cat. What is this connected to? It's really upsetting honestly, there were no traumas on account of this word. Do you have something similar?