I think you might wnat to go back and re-read your story. In chapter 6 or 6, Ginny was thinknig that the marriage contract was Harry was suspicious and that she didn't want to go through with it without some proof it was what Harry wanted, and now she's all gung-ho about it. And in Chapter 8, Dumbledore mentioned the blood wards to Snape as though they're still around, but he was told in an earlier chapter by Bill that they're long gone.
And I don't remember Harry saying anything about him telling the Order about the attack on the Grangers. He just told Luna to tell Hermione about the potential for an attack. He didn't even send the letter. So he didn't say anything about telling the Order and the Ministry about the attack on the Grangers.