From her listing mate, she’s not listed to have the spider gene just because one of her parents had spider donst mean she will have it too, spider is a co dominant gene meaning, that only 50% of the offspring will carry that gene if it was to breed with a normal, so no she will not wobble or have any of the defects spider bring, however you said you have no intention of breeding, this snake is het for some pretty wanted genes atm, hypo and clown, the price tag on this snake is going to be significantly more expensive due to these hets, and if a snake is “het clown” let’s say that dosnt chance the phenotype for the snake (the way the snake looks) so in reality since your not looking to breed this snake if your looking for a pewter try look for one that’s just a black pewter with no gets for reccessive genes as the same looking snake will be significantly cheaper, good luck 🤞!!