It's how she's gotten her way all her life. Using the baby voice with her parents, boyfriends, husband, work colleagues. She's going from habit.
You are probably right. How crazy is to go through life talking in a baby voice? Seems like a passive aggressive strategy to get what you want
Counsel needed to broaden the question - not just who did she speak to about her allegation, but was she in contact with people on social media, messaging, email, etc. and if so who.
If we subpoenaed her deleted social media I bet we would learn things adverse to her position.