Or rather she was conjured away.

In accordance with the instructions received from Moncharmin a few minutes earlier, Mercier took the good lady to the acting-manager's office and turned the key on her, thus making it impossible for her to communicate with her ghost.
Meanwhile, M.Richard was bending and bowing and scraping and walking backward, just as if he had that high and mighty minister, the under-secretary for fine arts, before him.

Only, though these marks of politeness would have created no astonishment if the under-secretary of state had really been in front of M.Richard, they caused an easily comprehensible amazement to the spectators of this very natural but quite inexplicable scene when M.Richard had no body in front of him.
M.Richard bowed ...

to nobody; bent his back ...

before nobody; and walked backward ...