No. Again, the child theme has no affect (at least, it’s not supposed to have any) on the site unless you make changes to the files in the child theme. If the basic WP settings have changed (i.e., the menu wasn’t selected, the widgets aren’t in the sidebar) then there is something else going on. Maybe a plugin or some other utility that was somehow tied to the main theme. I don’t know; don’t think I’ve ever seen this issue.