Awake in a Coffin

Where am I? How did I get here? Questions that had no answer swirled through her head. She tried to stretch her arms and legs. They could not extend.
"I'm in a box" She let out a breathy whisper
How did I get in a box? What kind of box?
She just can't remember... Suddenly, it was apparent. "I'm awake in a coffin"