Let me be honest with you, alright?
I like your plot, it's simple and cute, you'll catch a lot of readers with this kind of fluff

On a more serious note, I can't help but question the acts of your characters sometimes. I guess you've made a few personal changes in regards to the characters personalities to make them suit your plot and in itself, you're doing a good job. But I'll have to admit that I find your OC to be a bit too much of a guide instead of a character. She's an obvious rival and I like the base around her, but she's still a bit rough around the edges.
Overall, a simple fanfic that can make NaruHina fans squeal in delight, but more serious readers will probably become weary of the, and I mean no offense, blinkered plot.
Good work and I look forward to your next chapter! ^^