For one of my Administrators, she does not see 'Flush Cache' on the Managed WordPress dropdown. She does see Hosting Overview, Hosting Settings, Connection management, and help. How do I grant her access?
I get what you are saying. But for All Administrators >> Managed WordPress & its sub-menus are visible. There is no option to either grant or deny access to Administrator accounts.
As for the solution.
1. If He/She is using Godaddy Pro or MangeWP to Connect to your site. He/She could try to disconnect and Reconnect from there dashboard
2. Or you could simply create a new Administrator Account for here to access.
Hope this is help full for you.