Certainly looks hormonal blue. I just hatched my first clutch about a month ago.
Here is a link to the video of her being Gravid, I have other videos of the babies if you want to check them out.
http://www.youtube.com/watch?v=6vS60tChZDk
My girl turned blue soon as she ovulated as seen in the video. It was very obvious. But if you think she is close to laying eggs Get the male out of her cage! She will strike at anything that moves including him once she lays her eggs! And should she get upset striking in a fit to protect her eggs, she can giggle them and damage or kill the eggs! The eggs must not be rotated at all once they are laid!
Do you plan on incubating or letting mommy do it?