Speedwise she scales to peeps consistently dodging Magneto's electromagnetic waves = relativistic
There's also X-Cutioner's gun shooting radiation, which Storm intercepts to save Mags
And finally there's an argument to be made for Cyclops' beams (which several characters dodge or block) being light-speed. The end credits info cards reference the way his beams used to work in the comics in that he absorbs sunlight to then discharge it
Was gonna quote the stuff but there's an image limit, so you may as well just go to my X-Men thread which has pmuch everything lol