The exact answer to the ancient saying about the female protagonist hiding her intelligence was not clear. The search results mentioned some ancient novels, but did not provide specific information about the "female protagonist hiding her intelligence." Therefore, I don't know the details of the ancient saying that the female protagonist hides her intelligence.
Her closest friend might help her. Someone who really understands her and is willing to keep her secret. For example, Ino could be that friend. Ino has always been there for Sakura in the original story, so she could be the one to support Sakura during this difficult time.
Feng Ling 'er had been hiding her strength in the movie and did not dare to use the Flying Swallow Art, probably because she was afraid of causing trouble. She also hid her identity and strength from Bai Yuxiu and told her not to trust others easily. Some viewers thought that her performance in hiding her strength was not very accurate, because she was almost defeated by the Dragon Lock Array in the third episode. However, Feng Ling 'er's hidden strength aroused the curiosity of the audience. They guessed that her martial arts might have improved. All in all, the reason why Feng Ling 'er hid her strength and the subsequent development of the plot were still a mystery.
Perhaps some traditional pure - blood families who have strict ideas about gender roles in the wizarding world. They might not approve of Harry's actions of hiding her gender and try to force her to conform to the traditional male identity. They could use their influence in the Ministry of Magic or within Hogwarts to make things difficult for Harry.
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It varies. Sometimes you can find uncensored manga on Mangadex, but it's not a guarantee for all series. It really depends on the uploaders and the availability of uncensored versions.
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One possible reason for Sakura to hide her true strength in fanfiction could be for self - protection. Maybe she is in a world where showing too much power makes one a target. For example, if she is in a political intrigue - filled setting, she might keep her strength under wraps to avoid being used by various factions.