Why does Christie need to be nerfed? And what is a proper Christie nerf?
A proper Christie nerf would be propably be increased unsafety an certain string enders, hitbox adjustments on certain moves and removal of guaranteed options. It can't be that a character who has such a high speed, multifaceted string variation, many fast lows and good range on pokes is still able to beat out other ranged tools easily by simply PPPing across the stage, ducking even mids. She's way too evasive when performing normal pokes and strings, that's what her stance should actually be for.
While it is needless to say that this applies to grapplers in general, even fast strikers can't make use of their high attacks to interrupt her poking game due to her simply ducking them, allowing her even to strike straight out of disadvantage regardless.
Due to being so dangerous in close range with having tons of strings and quick launchers, she also does not deserve to have guaranteed critical burst options out of non-environmental situations. Something like this is absolutely legitimate on characters like Hayabusa who struggle with openers and unsafety while being supposed to shine in the stun game once the opponent is opened, but not for a strikers who's only real weakness is a lack of damage on throws.