Sakura used to be my favorite Naruto Character, yes she was annoying as hell at first but as she got older and matured and especially post-timeskip she became my favorite. That all changed by the time the Naruto Manga ended, Kishimoto just completely shat all over Sakura's character and here are 7 Moments where Sakura's character was derailed the hardest.
1.) Marrying Sasuke and giving birth to Sarada (Somewhere between Chapters 699 and 700): Because nothing says true love than a man who tried to kill you not once, not twice but three times and is clearly only using you to rebuild his clan.
2.) The whole Iron Country Arc (Chapters 454-483): The whole kittening thing but most notably her kitten "Confession" and when she offered to betray Konoha and leave with Sasuke. And before anyone says she was lying to lure Sasuke into a false sense of security you forget she not only offered to leave with him when he left Konoha the first time but also when he left to "atone".
3.) Making Naruto promise to bring Sasuke back to Konoha (Chapter 183): Looking back this is where NaruSaku died because this was the moment Naruto gave up.
4.) Telling Naruto that he only loved her because of his rivalry with Sasuke while also gushing about her love for Sasuke like the pathetic fangirl she is. (The Last: Naruto The Movie)
5.) Professing her pathetic undying love for Sasuke not once but twice. (Chapters 181 and 693): It's really kittening pathetic
6.) Screaming "Sasuke-kun!" when Sasuke was about to stab Naruto (Chapter 307): This may not seem like that big of a deal but think about it had Sasuke actually killed Naruto in the next Chapter the last thing Naruto would've ever heard is Sakura shrieking Sasuke's name.
7.) Asking about Sasuke first when waking up from Sasuke's Genjutsu (Chapter 698): Again this seems like not that big of a deal but think about it one of the last things Sakura heard before Sasuke placed her in a Genjutsu (Which by the way was her seeing him stab her in the kittening chest) was that Sasuke planned to kill Naruto. And who was the first person she asks about when she awakens? kittening Sasuke.