Why is a sub-space not visible but the content inside it is?

We created a space that is a sub-space down a few levels. I can see this space on my system as I navigate using the Space navigator on top. My office manager does not see the space from that method. She can get to the space by clicking on an update in that space and then she can move anywhere within that space. Why she does not see the space through the Spaces navigator?

If you do not allow view access on a higher level Space to someone and then allow them view/add access on any inner Space, they will have the permissions to get to the Space and work there, but no visible mechanism of actually getting there because all navigation mechanisms also follow permission structuring. It is recommended practice that in a Space where someone has elevated permissions like in your case, they should have a minimum of View permission to the full chain of Spaces above it. That way, the navigation can show the links correctly. If you give your office manager Can View permission on the above levels of Spaces from the target Space, she will get the Spaces menu to work as expected.