Is it possible to find the location of a linked body that is still up to date and fully linked?
Location can be in absolute or wcs.
Depends on what you mean by the location of the linked body. A body in a part file does not have an origin and orientation property like a component in an assembly.
If you have a reference to a solid body, you can query the coordinates of any (or all) of its edges, you could find the corners of the body's bounding box, you could find the location of the CG, or...