Floid wouldn't kill Rosavellt because he knew she was still useful to him, but that doesn't mean she is above punishment.
Rosavellt could see the irritation in Floid's eyes and she felt her resolve breaking as she almost backed down from asking him what was wrong! She knew she shouldn't try to annoy him anymore but she couldn't just leave him when he is this troubled! The demon lord has always helped her when she was in trouble and he didn't abandon he even when she was confused. She would not abandon him no matter what!
"I know I am overstepping my boundaries, master. And I know I have no right to desire your confidence. But I still wish to help you. I wish to be there for you and listen to you. Forgive my boldness...but you are my master and I want to bare part of your burden. Even if it is only a little,"
Creation is hard, cheer me up!