She was bred by myself from a male pastel and female spider. Nothing seemed out of the ordinary with either of the parents at the time, so I did not expect any other genes.
Unfortunately, both parents are no longer with me anymore, however if needs be I could search through some old pictures? I have ones of the pastel but not really any of the spider.
As for incubation, the clutch was actually overdue and at around 62 days, we cut the eggs and waited almost another week for the babies to exit the egg. I did think about incubation to be a cause, maybe if she was premature I'd imagine the pigment wouldn't have come through, but with her being overdue I'm not sure.

Thanks for everyone's replies so far
Dean