Ihave to write a 600 word short story. this is what i have so far. can someone me with what else i might be able to add? it is only about 200 words right now.

sally's first night working at the hotel has been pretty strange. she stepped into a room to change the blue bedsheets and found that they had been splattered with a red liquid. "blood! " she said outloud to herself. she ran out of the room to go down to the lobby to explain to the manager, bob, about what she had found. as she was running, she was stopped by a tall, thin woman. the woman asked where she was going, and after sally explained, the woman asked her to follow her. sally agreed to go with her.
as they were walking up a large staircase, sally asked where they were going. the woman aggressively told her to stay quiet. when they eventually reached a large room, sally observed black and white baggy curtains on the many windows. the woman told her to wait in the room, and then left.
after waiting in the large, dull room for a few hours, sally decided to leave. as sally headed for the door, she heard a loud bang. as she heard this, she ran for the door and down the stairs.