Just saying "conflict of interest" doesn't explain the wild leap of logic you are making to get from "she received money for a service" to "she will vote in their favor." How far down this rabbit hole do you go? If someone received speaking fees from a company, they're beholden to that company? What about a regular salary? Can someone be a former employee of a company and still be unbiased? Do unpaid internships count? If someone has political aspirations, are they allowed to work for anyone, or does that risk forming a relationship that might create bias in their hypothetical political future? What about politicians who lose an election? Do they have to avoid returning to the private sector, as that will inevitably introduce bias should they run for office again? Every single person on Earth forms relationships, personal and professional, and those relationships are bound to have an impact on how they make decisions. You can't expect someone to be completely free from that; that is literally asking for politicians to be "not human." It's an absurd standard to hold somebody to, and people are being dismissive of it for that very reason.