You see, if Neji uses rotation, he'll be on the ground which means the
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send him flying to the sky like it did to the Juubi fodder, assuming part one Neji is fast enough to use a full rotation and that he can rotate properly while the terrain right underneath his feat is devastated to the utmost degree. If Neji chooses to jump in mid-air before Sakura punches the ground, Sakura will use chakra control to
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and smash a mid-air Neji
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from Sakura launching herself towards Neji. Unlike part two Neji who can use vacuum palm to repel Sakura while in mid-air, part one Neji can't, therefore he gets obliterated.
I have no reason to believe that part one Neji can close the distance and stop Sakura from punching the ground especially when he has to get within arm's length to do damage to Sakura. He also can't use rotation while moving so he'll have to proceed with caution which just ensures that he can't get close to her. He isn't fast enough to blitz her, considering Kidomaru, who is slower than Sakura, managed to keep up with his speed just fine.
Also Neji has no knowledge on Sakura's sleep gas bombs, he'll most likely think Sakura is trying to obstruct his eyesight and charge right through. Sakura is smarter than Shippuden Neji let alone part one Neji so she has various ways of tricking him in battle.
OT: Sakura wins low-mid difficulty. With Katsuyu, it would be a stomp.