That first part, with the assault, is ch. 21; the second, with the "giving up her womanhood" stuff, is the last one I'd read, ch. 23. For the first, while it was somewhat graphic and awful, in some ways it was less bad than such things sometimes are in anime/manga -- I mean, Cecily did NOT like it, and was pretty broken and nonfunctional in that chapter and the next one. Her reaction to the assault was reasonably realistic, which is something when so often even rape in manga isn't portrayed as a problem (and yes, this is one of the things I dislike most about this stuff!). Oh, and she wasn't raped; the guy says he physically can't do such things. She was attacked, stripped, and mentally hurt, though, for sure, so it was certainly pretty bad. But it wasn't physical rape, just probably emotional, not that that's much less bad. At least she had a realistic reaction to it though, even if it certainly is a very stereotypical and very negative scene ("the woman gets sexually assaulted" certainly is an ancient trope in stories). I went into this chapter having heard stuff like what you said there, but I didn't hate it quite as much as I expected to given what I'd heard. 21-22 is bad, in some ways, sure, but could have been a lot worse.
As for the second one, though, the "giving up her womanhood" chapter 23, there are no excuses for that. That was sexism of a very bad kind, and is exactly the kind of thing I'd have expected from the anime version. I mean, seriously, her reaction to the above of wanting to "give up womanhood" was really, really stupid -- as if only by that she could be strong, or something? On come on. And then it gets even worse when she challenges Sigfried (the guy who'd done it to her in ch. 21) to a duel at a party... only to get psyched out by his words in reaction to his response, at which point Luke shows up and fights him for her. Because, you know, she's a woman so she's too weak to do such things on her own and needs the guy to rescue her and save the day. It is just despicable writing and storytelling. In the end she decides she "doesn't have to abandon womanhood perhaps" or something, presumably meaning that she doesn't mind Luke protecting her, or something like that. This chapter indeed is the manga being as bad as the worst of the anime.