Hello, Jim!
If you check the Changes for Richard (Lowery-1868), you will find that you actually linked Diana's profile to his!
Linking the 2 profiles may have caused Diana's profile to become locked (since she appears to be a living person). That's why it is better to adopt an orphaned profile (presuming it was open/white lock before the edits; may have been public/green lock) before editing it!
As Shirley advised, send an email to info@wikitree.com to have Diana's profile either opened or to add you as manager (not sure if support does that directly).