Do you have pictures of the parents? There may be another gene floating around in there as well.
My guess would be maybe one of the parents is pastel and this is a pastel Mojave champagne?
I will be VERY surprised if it is a spider champagne because as people said, most die shortly after hatching. The ones that live a bit longer usually have a lot of neurological issues. IIRC, Kevin at NERD posted a video about possible super spiders or champagne spiders and those animals are heartbreaking to watch.