The environment came with build in lights, there are 3 light sources: the two lamps and ceiling, the two lamps are turn off
If you look behind Josy on the bed you can see a pretty intense shadow of her running not-quite straight back. My first thought was that you have the "camera light" turned on (although the fact that her shadow does drift to the side makes this less likely). The Daz camera has a built-in light and the render settings allow for using it or not in addition to any other lights that are present. I believe the Daz default is to have it enabled, but most people have it permanently turned off for general-purpose rendering.
Either way, the point of mentioning the shadow is to say that there
is at least one more light in play, and
it is the dominant light in your scene. Josy's shadow could not be caused by a ceiling light.
The other primary source of light that can go unnoticed is the "environment". Whether the environment is being displayed in the image or not it can still be turned on as a light source.
Lastly I'll note that a while back (around v4.16 I believe was the last version before the change took effect) Daz made some significant changes to lighting (having to do with nVidia and bug fixes). It had a major impact on emissives/lights that use any degree of transparency. I mention this because depending which version of Daz one uses compared to which version of Daz was used by the content creator to set lighting levels... they may not look as intended.