All but one look great. This one looks stunted

This plants growth is severly stunted and looks very burned (nute burn)

What are your thoughts on what this is.

I have been feeding it/watering it the same schedule as four others, and they all look great.

I have flushed this one twice in two days trying to keep it alive.

I wait your feedback.

Sometimes ya just gotta bite the bullet and let her go.
You flushed a couple times, thats about all I can think of.

Is the nute burned plant a different strain then the other plants? Some strains love all the nutes you can give them, others are very nute sensitive. At this point, I think you've done what you can. Let her finish, she'll probably survive on her own. If you feed her again, use half the amount of nutes you've been using.