I'd say it's both. The kid clearly enjoyed the fun voice, but understood the commentary as play (i.e. not real). That's why she'd ask at the end of the night, "did you really like it?" Then she got direct, explicit positive reinforcement.

And those direct comments were probably taken to heart. Kid probably used those to focus more on specific parts of her work. Little kids can be surprisingly perceptive long before they develop adult intellect, focus, and sensibilities.

I would definitely say this was an "it's both" situation.