This just happened to me too. It was indeed hilarious as we all watched her body take off down the beach. Stranger still, I could ask Helsin about Kagha after that regarding whether he would select her to lead the druids. I expected him to say no, because she's dead. But he gave his same spiel.
After resting, my party returned to the grove where Kagha's body now lay. So I guess that's where she slid off to.
