It's useless thinking that Cyrill could protect Milkit. Because Cyrill isn't there, probably won't do it and that's not even an option right now. Flum, that's your job. Only you can be there for her. It's bad that she's drowning in self-doubt right now.
Milkit's gaining a stronger sense of self and is learning to get out of her shell, but boy Flum's flashback had to come at the worst timing. She's trying to break out of her slave conditioning and actually reach out to Flum, good luck.