How about a pic of the whole plant?
Sure would help to see the whole plant… especially if you say that was her only leaves 
i cant light now but its oitside and 3 foot tall and bushy so loads of leaves all looking healthy
We’re just guessing without more information, but keep in mind that it is normal for cannabis to shed its lower leaves as the plant matures.
The leaves look a bit heavy on nitrogen. I would feed a little less of whatever nitrogen product you are using.
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