As soon as she saw him, Rebekah gave in to at least one of her impulses and threw her arms around Kol, burying her face in his shoulder and clinging onto him tightly. Several long moments passed before she actually spoke, her voice muffled by his shirt. "Hey." There was a fear, an irrational but genuine fear, that if she let go, she would lose him again.
So even when she leaned back a little so she could actually speak clearly, Rebekah still had a grip on him, even going as far as letting her fingers curl around his shirt so tightly that even the slightest tug would have torn the fabric.
"What do you need?"
Because that was what mattered. Everyone might have their own feelings on Elena's arrival, fuck knows she did, and Stefan, as illustrated by his departure. But Kol was facing his murderer. At a time when he was stressed anyway, and Gabriel seemed to be giving him the big brother talk over Anna, and Crowley was possibly going to explode or something. For all Rebekah knew, Kol was teetering on the edge of a rampage, and someone might need to pull him back.