We just saw that Hinata hasn't change at all, she's still the same shy girl that she has always been. We saw that she's too embarrassed to give Naruto that scarf. And now all of a sudden she's perfectly OK around him. She doesn't have a problem rubbing ointment on Naruto's back and she's perfectly fine kissing him.
Hinata's character revolves around Naruto so.... this is her character development