I’m of the impression that Sarah Keovongsak should be able to edit this page, using her “limitededit” role which can only edit pages owned by sarkeo.
She’ll want to test this, of course.
Sarah is no longer the owner of this page, so hopefully can no longer edit it, but is the owner of the subpage:
Sarah, can you edit another page, for example:
https://amwtest.web.itd.umich.edu/wordpress/wp-admin/post.php?post=156&action=edit