I agree with Margy. You should not have made her relive it to her teachers. This should have been discussed with a therapist. They see this kind of thing, and are trained in it. Teachers are not.
Maybe you should get her a safety bear. Tell jet this is Mr Bear, and he has come to protect you from all the scary things.
I think a night light might help as well. It's alright to need one.
It also sounds as if a lot was made of it and down playing is now the way to go, I dont think she is making it up but I think all the attention has made it worse , and it is possible she is 'milking 'the situation.I do think that you should take her to the doctor and see what advice he will give you ..In my opinion the way to handle it, will be no more talk about it, and then work out with her a night/time frame for her to sleep alone, tell her that on 'Friday I am going to come in read some stories to you, and then go back to my room to sleep with Daddy'.'and be consistant , let her have a light on if she wishes ,but firmness is the only way .Or sleep with her until she isnt afraid ....good luck
You have to let her know that - she can deal with it ! - Put something like a rotating light in her room. Something that moves. A fish tank at her age is a good idea. Ask her if she thinks one of these would help.
Then tell her that she can deal with it in a kindly way and ask her how she would like to approach it. Do not give in to her fears by sleeping with her. She will lose courage in herself then. She has the capacity to deal with problem, just be encouraging.
All the best