What’s happen to my Lady?

looks like your growing in pure coir, and that's not to good. Coir is void of nutrients and can suck some of them away if its not buffered. Coir for seedlings with out perlite can hold onto way to much water and drown out seedlings as well. Yellow tips on its first set of true leaves looks like it may need some food. But check your PH and mediums PH before feeding Also sometimes seeds just look like this but get better. I'e had weird cotyledon before.

I have a GrowCan so it was fed and fixed into the soil. I have led lights.

Could also be light stress what are you feeding? What light source?

Nutes! She's gonna need n soon

I've been struggling with similar looking seedlings. Mine have even more yellow though. Also, I'm doing hydro. This is my first time with dealing with this issue and the only thing I could come up with after checking all environmental variables was water PH. It was too high, about 7.7.

Possibly overwatered. Looks like you're in coco, I heard somewhere you can't overwater coco, but I think that is not true for seedlings.