Camille Needs Kit Changes & Numbers Buffed
You've created another Ekko. Congratulations.
Let me help you out here:
W:
She already has a dash, a movement speed buff and a shorter dash / ult that completely imprisons the target... And this skill already does % health damage AND heals Camille. Does she really need a slow tacked on to this? If so, does it really need to be 90%?
E:
"Despite what one might assume from a wall-jumping ability, Wall Dive can be used to go through terrain (including the terrain she is bound to)."
...Why was this needed? If it's what's assumed, why not just keep it that way? The ability is fresh and new before this random secondary part, which thematically makes no sense, and you even acknowledged that fact. It's a dash. With a stun. Remove her ability to jump over walls.
R:
For how much you like to talk about counter play, this thing is a total mess. Let's start with the basics: it doesn't need a 4 second duration. If anything, 1 / 1.5 / 2 seconds. That's it, at most, for a skill that prevents escape by any means. 4 seconds at rank one is absolutely ridiculous. You cannot possibly expect many of the champions in this game to be able to do much to react in that time frame. Cooldowns exist on skills, and for most champs they are pretty damn high early on. It's wonderful sitting there so I can be a punching bag for an eternity. Think about it this way: people joke about reporting them for being AFK, and that is a full second less at max rank.
If you would like to add counterplay to it, flip what it does: keeps other enemies from entering the zone, but still allows the targeted champion to get out. Would this make it a better Xin Zhao ult? Absolutely, but let's be real, Camille's current ult is a Jarvan ult on steroids.
tl;dr: Riot is apparently incapable of releasing new champions that don't have sixteen passives tacked on to each skill. Camille desperately needs counterplay to her kit and numbers buffs to compensate.