yup - she will soon be laying a clutch on infertile eggs. The coloration is showing that she is receptive - if their were a male around to notice - LOL! Pretty colors, huh?
Typically it should be in about 4 weeks. I emphasize "typically" b/c Luna, my veiled, strung me along (and this very supportive and tolerant forum, I might add...) for 5 months before she FINALLY laid 42 eggs in May (began appetite change and color back in December!). Have you noticed a decrease in appetite lately? Even though these are not fertile it depletes a lot of calcium so you will need to make sure she is getting plenty. Silkworms and butterworms are a good natural source. Make sure she is well hydrated, too.
In a couple weeks you will want to provide her with a laying tub. I used a combo of sand (you can get builder's or play sand at home depot) and coco-fiber which worked really well. She will dig and lay so you need to make sure the soil will not collapse on her. It needs to be deeper than she is long and moist (not wet).
I will say that even though Luna had been wandering and restless off and on for a long time she became VERY restless two days before she actually laid.
I am sure you will have other questions but this should get you started.
lele
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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (MIA 
0.2 felines - Kyndra and Líta