Clementine takes the shove as such. That it's playful and some sort of way of showing their affection. She was an only child back home, but in a way, over time in Asgard she came to view others as sort of pseudo siblings. Which includes Ellie and Riley. Not that she has expressly actually admitted this.

"I already told you. I'm pretty sure. There was putting bugs under Duck's pillow. Or the salt lick."

Because. Well, she's pretty sure Riley wants a different kind of gross than Clementine trying to deal with some injuries on her own, for example.