I read where you mentioned the only male the pastel mom was ever with was the spider and that this was the only good egg. I'm not aware of a commercial paternity test for snakes but maybe you could find a university to do some custom tests on this girl, her mom, and the spider male to help get to the bottom of this.

One possibility is parthenogenesis where this girl might not have a father. The thing is I think of the two types of parthenogenesis identified in snakes the one where half of mom’s genetic material doubles up (which could produce a super pastel also homozygous for half the other genes mom has perhaps adding to the weirdness) would only produce males and it sounds like this baby is a girl. The kind of parthenogenesis that produces females produces exact clones of mom but maybe this could be a new type where two egg cells merge or something like that.

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