How is this being fixated? Hillary released a book or in other ways came up in the news cycle. Media of many political leanings commented on them. They were topical. That doesn’t show they have a fixation about her.
You wanted a source, I gave you a source with multiple links over a several days about a public figure who ran for office 5 years ago and lost, and yet they haven't gotten over her and likely never will. There are many more sources that are websites, and literally countless other comments from people on social media that show they can't get her out of their heads. I'm sure I can find posts by people here too who've referenced her in in relation to just about any current topic - whether it's her emails, body count, Benghazi, her emails, Whitewater, speaking fees, her emails, Uranium One, baking cookies, Clinton Foundation, reset button, her emails.