Large plant having trouble.

I have a pretty large plant that has been growing perfectly fine but now something seems to be wrong and I'm having trouble diagnosing it. I tried using this site( http://www.growweedeasy.com/marijuana-symptoms-pictures ) but honestly it looks like 3 or 4 different pics on there. Some of the leaves start to point down & some have started to cup and fold in like the one leaf on my hand. Is it over watering, under watering, nitrogen toxicity or maybe a copper deficiency? Any help would be greatly appreciated. And just in case anyone does ask, no I don't honestly know what strain she is yet but she is a female for sure.

have u checked the PH of the soil

how much do u water it

what soil are u using/what are u feeding (how strong)

Back off the N a little bit in your waterings I would suggest you look to be on the edge of N toxicity. Couple of regular waterings and you should look better, but do keep feeding it except for the N. Good Luck

I think the PH was a little off but the plant seems to be fine now. Just gave it some regular water for a few days and then continued with less nutrients. Thanks for the help.

Blah Ph Blah,blah.......Your in soil. Soil self adjusts the Ph so ignore that!
Over/under? Water like this. Soil feels dry 1 inch down (stick in index finger til down to the first knuckle) water. Feels wet, don't water.
Water at lights on! NOT lights out!
Suggestion on how much to give; Some water till it begins to flow from bottom of pot. This method works good, just follow the 1 inch down rule!!!!!!
Some water 4-500ml to a 2 gallon pot (this can go up in flower to allow for plants increased liquid needs -same for the others) once a day at lights on...5-700ml for a 3 gallon and 8-1000ml for a 5 gallon. Keep in mind that smaller pots dry out faster then big one's! Soil mix's vary in how long to dry out too.
These are baseline amounts and do vary. It's up to you to balance it so the plant is watered everyday at the same time........Need a day off? Use the flow through method and return to every day when plant is again dry 1 inch down.....
Simple, effective and safe.

By the way,,,,your plant looks fine! Water as above and return to your full strength nute ratio!

Good Luck