Looks like about 2 days. Its up to you if you want to keep her in a net or just let her drop in the tank. I wouldnt worry to much at this point about moving her, I believe that she is too far along to abort.
I just let mine drop in the tank, i dont want to be overrun by guppies and i always have some survive.
I have never really noticed a real pattern to how my livebearers drop compared to light levels. Mine always seem to wait until I am gone for the day before they drop, but I think that is about being secretive rather than light levels. The lights in my tanks come on around lunch time and the drops happen sometime while I am away. The room the tanks are in has plenty of light long before the lights come on and even have light while I eat my breakfast and watch the tanks.