Is Camille A Human Or Robot?

She's a human with Hextech enhancements. Here's her lore page: http://universe.leagueoflegends.com/en_US/champion/camille/

Hextech augmented human

She was born human, got modded heavily, whether or not she's still "human" is mostly a matter of opinion I'd say.

Cyborg

She's a lady who has had a large amount of her body replaced with hextechnology.

She herself questions whether she can still call herself human, which is perhaps the greatest sign that she still is.