But what does it mean?!

This is River's 'I'm communicating!' face.  I'll direct your attention to the hieroglyphic-like placement of bunny poo on the right of the pic.  I seriously have no idea how she managed that because it doesn't look random given the spacing.  She is seriously proud of herself here...and I still have no idea what she's trying to tell me.

I think it's just now dawning on her that I'm a bit simple and she's gonna have to dumb this way down for the average human.

(What River sees:  😜 Duh?)

I gave her some noogies and a treat, which seems to be something I'm good at!

(What River sees:  😀 Give bunny food! Yay!)