I know I won’t touch all the mental concepts that Katja has right now. But here are some (more noun like concepts) that I can easily remember:

• Beard
• Bird 
• Bath 
• Blueberry 
• Ball 
• Bottle
• Bye(-bye)
• Dad
• Mom
• Water
• <æ> for Andrew 

She has some verb like categories or actions that I think are salient as well. Some of these things are tactile motor movement skills which require some sort of mental conceptualization, while others are directional in nature:

• up (which is not just vertical, but might include “hold me”, or switch people holding me)
• down
• open (pull)
• closed (push)
• More (food)
• Turn around to get off the couch or go down a step
• Point
• Wave bye-bye
• Soft hands (as in gentle hands — when she is pulling my beard)
• Dance
• She also crawls and assisted walks
• Feeds herself (we can assume that she can feel hunger)
• Takes things off: She doesn’t like anything on her head, can take her pants off
• She likes to reach out with her index finger and thumb and experience the feeling of hair
• Reads a book while cooing to herself
• Plays the drums
• She is music aware
• She is speech sound aware (she knows she hears a sound she is not making and that it is different than what she is making) for instance the difference between <ah> and <u> but can not yet pronounce <u>. 

She has a sense of emotion that clearly includes:

• Happy laughter
• Empathy when others are crying