They just gave her Sakura's backstory bc why not when they already gave her her looks , style , theme , role her men and what not after all they know Naruto only loves one women and that is Sakura her type her personality really I'll be so ashamed if i was a NH fan bc they have nothing original going from them it was all given to them by recton and asspull no jutsu
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Hell, some people say Toneri reminded them of Sasori( in terms of looks.), so Hinata got a similar villain.
It's really hilarious that they made Hinata a knock off of Sakura, instead of working with the little bases they had already set her up with in part one. It's clear that SP only love Hinata for her boobs, because they're always trying to turn her into something she's not. They don't like her shy personality, don't care for her relationship with Hanabi( since I heard the episode was just Hinata wank, instead of establishing a sisterly bond.), and they don't even care about her back story( which was somewhat interesting.)
Instead, they gave her a lot of Sakura's things, a power up like Sasukes, and threw away her shy persona part way through the movie. SP is no better than the dumb YT reviewers who praise Hinata for her chest, because she has no character development to speak of.