To keep laying they need about 14 hours of light each day. She could be molting which will reduce egg production also. Adding light will help but it can lead to other things. Like not laying as long( laying lifespan). Personally, I feel that their systems deserve a break, laying takes a lot of energy and resources from their body. I do have lighting in my coop but it's used for cleaning and maintenance rather than production.
I do disagree with the common idea that having lights is a fire hazard. We all have lighting in our homes and for the most part, were not all going up in flames. Properly installed and maintained electric appliances are not the Boogeyman. It's faulty installation or improper use that leads to problems. As long as you choose items that are designed for the intended use there's little risk.