Did the ghost speak, or did the words just somehow echo in her head?

From the way the ghost spoke, Norton had no certainty of that.

"I wish the ghosts would speak more clearly."

The controller also acts as a mobile phone in which ghosts speak to the player character via the speaker.

Real or pretended, this ghost was speaking to the point!

On two occasions, the Powers send ghosts to speak to people.

Lucas takes Simon's place at the factory and becomes convinced that his brother's ghost is speaking to him from the deadly machine.

This beheaded ghost spoke with a heavy voice out of its severed throat.

He stood alone in a place where ghosts could speak and the truth be revealed.

That ghost spoke in a voice like no mouse.