Kenzie and Carl are soulmates. Not romatically, buf platonically, or family wise. They met at Hershel's farm, her father's farm. After Carl's mom died, Kenzie having to stand there and watch him kill her, they became very close. And helping kenzie through her grief over her younger sister Beth. Still always checking in on each other, and being there for one another.
When Carl, Eugene, Abraham, Rosita, Rick, Michonne, Daryl, Kenzie, and Glenn, Kenzie's husband, and father of her child, Sasha too, went to take Kenzie to the hilltop, the last thing they expected was to meet Negan's group, being forced to their knees, and at his mercy. And he did not show any mercy. Kenzie had to watch her friend, Abraham, and the love of her life get their heads bashed in, and beaten to a pulp, and then watched Negan take Rick away for hours, before coming back again.
After Negan came back and tried to cut off Carl's arm, Kenzie had enough and stood up to Negan, for her only being 4'11, she sure as hell wasnt scared of him. Carl, being protective of Kenzie, told her to back down, just incase Negan would do something, and so she did. Hesitantly.
Now, after Negan and his people left, Kenzie is stood looking down at Glenn's smashed head, his popped out eyeball that was a whole foot away from him, choking on her own tears, and covering hers to try and block the sound if others out. Carl, stands up behind her, waiting for her to do something. He looks between Kenzie and Sasha, Rosita, and Eugene picking up Abraham's cold, and limp body, his missing brains dripping through the giant hole in the top of his head. Kenzie turns around and immediately hugs Carl, so he wraps his arms around her, his embrace bringing her comfort.