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Strange. She's quite stretched and not many nodes (though pretty and healthy otherwise), which would indicate lack of light, yet she wilts under the lights, as if they were too strong?
I would have guessed you were overwatering her, that tends to make them wilt, but you said you don't.

Maybe it's lack of nutes after all. Sorry, someone more pro than me will have to answer. I think KP's suggestion are good, though.

Edit: On closer inspection, she seems to have stretched earlier on, but is getting denser towards the top - my guess is you haven't been moving the lights and that she's only now reaching them?

Nutes: I'm no expert on that either. I know people don't recommend mixing organic and synthesised. For myself though, I'm mixing NPK with PK, two completely different brands, and it's working fine, but I think some brands may not marry as well.
You should post the NPK values of the nutes you're using.

Sorry I don't have better answers.

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