Why is Kathy being inc look included in an under the mistletoe bachelor special?
Because she's part of ASKN--4 contestants who didn't get that far and have banded together to create a "brand" allegedly based on real friendships that developed among them while they were contestants. Contestants are April, Susan, Kathy and Nancy. See e.g.
https://www.latimes.com/entertainment-arts/tv/story/2023-11-10/the-golden-bachelor-askn-women
I think it's been an incredibly smart move. I think by now all 4 would have faded into oblivion, but together, they haven't. It's no accident that they are the unsuccessful contestants who are being featured in Bachelor ads.