Well, it's obvious enough that she took a photo of those two together and will probably show it to Amane, but the other potential applications include her using it as leverage / blackmail, or submit it to the same contest that Tarumizu is entering - heck, maybe using it as blackmail in the form of a potential contest submission to get Amane to stay away from Nene. Regardless, her smile at the end is already broadcasting "I got some good shit on her".