It's something new and exciting and probably got a response from you; a smile, laughter, any attention really. So she is proud of herself for doing a good job. Next week it might be something else and nodding her head will be momentary forgotten. It is the same with words.
My daughter was doing that around the same age, but stopped after a while. Now, she's going on 11 months and REALLY tells me no now LOL. She's so mean to me, she bites and scratches and pinches me...but then she gives me the best slobbery kisses ever! She's like the Sour Patch Kid in those commercials lol!
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Completely normal and adorable!