They just need to lower the dmg amp on nidalees spear a bit but almost completely gut the Base/ap ratio on her heal. Since you build glass cannon anyway, your heals endgame are just absolutely insane. Also, who the hell knows why her .7ap ratio heal has a freaking 60% atk speed buff attached to it.
Heck, making the max spear damage 200 or 225 instead of 250% would be fine, change her heals AP ratio to something like .2 or .3 and cut the atk speed buff in half or just nerf the shit out of the cooldown. It's a 10sec cooldown so with max cdr it's 6 seconds. ggggggggggg, now her infinite sustain & poke with grail is solved.
So, nerf spear damage just a tiny bit. Nerf her heal extremely hard. Give cougar form the free ar/mr back. gg nid is fixed and still viable.