Yeah why are we pushing it on Hanako? Let's take it a little bit easier. There's plenty of time. Though the loss of a cop is indeed troublesome.
And worst of all our cop didnt divuleg who they investigated
My guess is she investigated Souji. The colors indicate that the nature of his role changes, and perhaps he was investigated on a night where he would have turned up guilty. She was very adamant that he be lynched.