Toddler and Bedtime woes?

My twenty nine month old has begun waking at night, screaming and crying saying she is scared. Everything I have read suggests to go in comfort them and then leave (uming their kids are still in a crib ) but she is in her own bed and will come out of her room and shut the door behind her. If I pick her up comfort her and put her back to bed she will just get up screaming and crying and we repeat this over and over again. It has been waking everyone up and I am sooo exhausted. What can I do?