Help, Please - Nitrogen or overwatering??

Hi Everyone - I am sorry to dump a what is my girl's problem here but...

I am in day 26 of Veg - she started out as 1 of 8 seeds which I don't know the strain and started in the wet paper towel method.

Starting info -
She is in a 2x4x5 text with a 400w MH at 18" from the plant with a 4 in can fan
73-81F through out the day and 28-39% humidity
Watering schedule is 36-48 hours and just enough till it over flows her saucer
Grow medium is Roots Organics soil
Nutes are Roots organics grow - 10ml/G every other watering (started at 14 days)

Problem - I noticed a considerable droop 4-5 days ago and I through it was root bound
Transplanted to a 3 gal 3 days ago and have water her with straight water - no nutes till I figure this out

Pics are from before droop - Transplant and then after...

Is it just the growth weight of the flowers, Nitrogen toxicity, lamp too hot?

Any help to this Noob would be greatly appreciated!

'Transplanted to a 3 gal 3 days ago and have water her with straight water - no nutes till I figure this out ..'. and a big thank you from this end!

You plant is fine but could do with some red light notice how close those inter nodes(distance between the leaves on the stem) are, find a nice day in the sun and leave her out in the sun at every opportunity you get or put her to 12x12 under that HPS

Lamp too hot. Get a fan blowing directly on the light. Picture #2 shows the temp at 91 F, that's around 33 C, way too hot.

Nice looking plant.

need that temp down brother get it to 24c. and for over watering how often does you soil dry out? remember the soil need to get dry for 6h so the roots can take in air its a must for growing. so just look at how long it take your soil to dry then let us know

Thanks everyone! I have her set now on a 12/12 and as soon as this cycle s done she is going onto a 400 watt HPS. I let her go a full 52 hours without water and then gave her about 1.5 quarts of straight water till it flowed through her pot.

When she turns off tonight going switch over to the HPS. - I'll follow up with pics after she gets used to the new cycle.