Her name spelled out backwards is “Satan’s Helper”. Legend says, if you write Repleh Snatas on a mirror 6 times under candle light, then blow out the candle…the mirror will crack until she appears behind you. Upon lighting the candle again and closing one’s eyes, she will be gone. If someone turned behind them during this moment, then they would be killed by her.
Source: http://www.freaklore.com/this-cursed-haunted-website-has-people-scared