How do you move Quiet to a different position

Quiet does not seem to follow me like other buddies, is there a command to move her ?

Solution 1:

On the iDroid map screen, pressing up or down will scroll through available commands. One of which you can select Quiet's sniping point, and another will let you select a location to scout.

Solution 2:

I've also been having this issue - the trick is that you essentially have to redeploy her from the Buddy Support screen. This is found in the iDroid -> Missions -> Buddy Support.

When on the Support screen, you can select either of Quiet (Scout) and Quiet (Attack), which will relocate Quiet to a specific location, which you then select on the map.