The dragon administrator who came to see Kumoko before D did some translating is by all metrics a literal god...and he works for the demon lord.
I get what you're saying, but given the evidence the logic doesn't really follow.
Sophia is 100% the creepy girl who was behind Shun at the vending machines in the Japan flashback. That's her name.
Snaggletooth is now cute vampire fangs. Dingy stringy hair is now perfectly coifed honey blond curls. Forgettable face and sunken features now enough to make a spider-girl jealous immediately.
Kumoko doesn't waste food. Period. She's almost starved to death a few times, and she learned her lesson. Eat what's there, recover your SP whenever you can, because having it topped up has saved her a few times. She's survived when her enemies have not because she's always fully fed.
Humanity is relative. Vegans call meat eaters inhumane. Kumoko was willing to save people who meant nothing to her, saved Sophia again where Kumoko has absolutely no stake in the fight, solely because she wanted her to suffer less.
- Hugo has become a monster, because he believes this world was made for him. No real reason other than that. Shun has implied that his other friend (who isn't around) is the one who kept him under control back in Japan, so maybe he's always been like this.
- Yuri happily looks for Taboo tags so she can have them burned at the stake or something. That label is all the evidence she needs in her mind. Even if Fei saved them all to earn one. Yuri's childhood abandonment and subsequent care at the Church's hands seems to have made her this way the last 15 years.
- Potamias, the elven king, or possibly even Oka, apparently ordered soldiers to murder Sophia's parents and kidnap her.
Kumoko, aside from eating dead things regardless of their prior category, seems to be doing pretty well on the humanity scale. She's had minimal human or even sapient being interactions over the last year or so, and seems to be doing pretty well for herself in terms of still caring for others. She's been through some pretty awful stuff too.
The others, aside from Yuri and apparently Sophia, were pampered for most of their childhood. Kumoko was given a nearly certain death sentence with her starting place.
edit:
I rewatched the scenes where it is showing Kumoko attack because they're awesome. But when she's hanging there right at the beginning, I recognized that she kind of looks like a Hannya mask now, which is pretty cool.
(Also looks like some spiny orb weavers)