well who ever said some of her wasn't organic. for all we know most of her inner body is actually regular human organs with cybernetic applications to make them work more efficiently. never once was it outright stated she was an android or a robot. she could be more close to a cyborg. plus if she was mostly mechanical, she'd be much more easily discovered since there'd be a bunch of mechanical noises coming off of her, she'd never eat, wouldn't sleep, as well as various others. really all we've seen is that her skeleton at least has metallic plating and at most are mechanical replacements for actual bones which is all pyrrha's semblance would of needed. think wolverine vs. magneto for the logic in there.