Dear S.,
I'm not here to be mean or anything but why are you taking the night light away? Your child is afraid of something. At this age it could just be stress related especially if she's adjusting to new changes (move or school related) My sister used to have night terrors really bad at this age. She'd litterally wake up screaming and crying and my mom would rush down the hall to check on her. We found that she'd been nervous about an upcoming test or that someone had been picking on her at school. I would set aside some time for her and just talk to her. Ask her about random things. Also, what does she watch on television? If you watch alot of these newer cartoons there are alot of ghosts and monsters and stuff, nothing too scary for a kid, but at this age the imagination is really blossoming and that may also be a reason for her being afraid at night. There is nothing wrong with her being afraid. It's just something that she is going through. Try not letting her watch tv at least 2 hours before bedtime, no caffenated drinks, no candies or sweets. Pay attention to what she is watching, reading, learning at school (it's october, so alot of times they start taking about ghosts and scary stories) is there a big test coming up? Have y'all made a big move lately or someone pass away recently? These are just some ideas. Give her back her night light, I seriously doubt her being in complete darkness is by any means necessary. If anything, it's probably just making things worse (think of it this way, we have our senses, see, taste, feel, hear...if one sense is taken away..in this case the ability for her to see clearly, another sense will perk up to accomodiate, *my aunt had brain surgery and has lost her sense of taste, smell and almost 90% of her sight ..this is something I learned by going to therapy with her* so if she can't see, her sense of sound may perk up and then her imagination will run wild..what was that? who is there? where's my mom?...) YOU are her source of security and comfort. If anything, you can do the "monster spray" or the "magic coins" as previous posts have suggested. These are very creative ways, also if you are religious, teach her prayers! The guardian angel prayer worked really well for us as children. I wish you the best of luck, I know it's not easy, but remember, this too shall pass, just another phrase we all have to go through..
God bless you.