Even if that is the case, it doesn't change the fact that she clearly felt the other guy would have a better chance of getting the spot. Otherwise, why didn't she just apply like the other guy had already done, and let the best (by whatever standards they want, whether it be experience or perspective) person be selected by the conference organizers?

Tell me, how would you feel if you had already prepared and turned in an application, and then some random person asks you to instead help with an application for a "panel" to replace the individual speaking spot you had already applied for? That man had absolutely no obligation to indulge the author's desire to have a panel.

She's not a random newb. She invented the thing that he wanted to talk about.