How to get sitemap to include new section of website?

Unfortunately, you are likely not going to get an answer, though I hope you do. The new section may have defaulted to “exclude” in the actual plugin settings.

That’s why when I create the WordPress Google News Plugin it was designed to include all posts, even new sections or custom post types, and just gave the option to exclude all articles on a post-by-post basis instead.

Anyway, check if your new section is excluded as a category. I’ve used this plugin in the past.