Daemon had originally come to kill Aemond but upon hearing the idiotic boy had murdered and burned Harrenhall and House Strong to the ground. He rushed back there, completely missing Aemond and Vhagar, he might not have been the most active parent in his child's life, he still cared.
You don't know how much you truly care until you think they're in trouble... or even dead.
He needed to know his little baby girl was alright, he loved her in his own way. No one knew her true parentage and he would make it known if it meant that he could protect her. He searched Harrenhall up and down for some time before he saw her, sitting outside under a tree.
She looked so alone, no one else was alive from the looks of it, he could see the new burn marks on the stone walls, he could still feel them giving off heat. He walked up to him and crouched down at a distance; he didn't want to scare her.
"Little dragon?" He said softly, she looked up at him and froze.