I think lightning bolts from the heavens trumps bullet resistant hides and acid blood.
The aliens entering Olympus aren't going to stop a slaughter. Stuff like godly flaming swords are great vs aliens, and lightning has enough power to pop them like popcorn.
I keep thinking their resistant, though not immune to electricity. To what extent will the queens and above be resistant to the thunderbolts?
Something being resistant to electricity normally means more energy is transferred to heat. It means the electricity is less likely to pass through all her internal organs, more likely it's just going to superheat and blow up the area it hits.