My seedling needs help! toppling over... String stem PICS inc..

here are a few pics of my newest seedling.. I have her under some eco lux flouros and I have a 100W HPS. She has some deformed and missing sets of leaves... I am holding her up with string against a post. She is top heavy but the stem as you can see is skinny skinny... Ish she stretching? does she need to be closer to the light? I had her about 4-5 inches away... any advice would be great...
Thanks so much

Maybe it's just my eyes, but in all three pics it looks as if the stem that meets the soil just as its going into the soil is extremely pinched looking. I'm betting if you were to pluck that seedling out of the soil right now the root system would be almost nonexistent and the stem would probably break off at the soil line. Which does NOT bode well if that's the case.

Not that you should pluck it out of the soil, give it some more time, but I'm feeling a bit scared for that seedling. But the top of her looks good though. I'm thinking (guessing) pyrethium wilt at this point. She doesn't look overwatered, so maybe it was soil borne? It's hard to say. She doesn't look like she's stretching, so much as her stem is just wasting away.

I do hope that she pulls through :)

what is pyrethium wilt, and is there a cure for it. The way you made it sound, I'm guessing not. I am trying to keep her alive... I will keep you all poseted but any more advice will sure help guys!!! my other four are doing extremely now now though..