Her card was not there. She said that to confuse Flores about where the photos had come from. I don't see that it makes sense to put the pictures on his camera as proof that she'll blackmail him.
Her plan was to kill him, and the plan was formulated before she left yreka. So there's no need to blackmail him if she knows she's going to kill him while she's at his house. If she premeditated murder, then blackmail is superfluous.
Her hair was lighter in the police interrogation videos under the harsh light. I believe the flash on Travis' camera probably made her hair look a little lighter, but she was blonde in April, according to Ryan. She last saw Travis in April, according to her. In most of the pictures during her relationship with Travis, she's blonde. So there's no way she had brown hair with Travis on his bed at any time before she dyed her hair on June 3rd.
I don't think the lightness of her hair on the bed pictures means that her hair wasn't dark. We know that her hair has been brown during trial. Look at this picture of her post trial interview.
Same interview, picture pulled from a different website:
It kind of looks to me like she is starting the graying process.