It is such a minute nerf to her. If you catch a dagger, the difference is barely even noticeable. One might say that her shunpo CD never should have been that short early game in the first place.
It does punish her slightly if she uses her shunpo aggressively but doesn't/fails to catch a dagger, but good kats would hardly be affected.
That said, please don't reconsider the ultimate change. That idea was such a thoughtless nerf.
I believe that she generally shouldn't have AD ratios. Maybe touch that a bit. Gunblade gives her too much utility and damage.