Hmm, well now that more leaves have developed over the last week, all showing the same thing despite the changes... I'd say this is an unusual mutation/growth aberration which often comes with poor growth performance,... nothing to do mate, she locked in this,.... grow her out yank her and start over, your call,.. but she won't make any "comeback"... Consider going to soil, maybe even using something like Mephisto/GBD "super soil" amendment mix; all you do is mix it into the soil, make a base layer of it, and add reg. soil on top, then it's just water from there! ... Biotabs is a great product,.... not tested here yet, but SoHum super soil,... all you'll need is a good soil pH probe like the Accurate 8 to monitor in-pot pH, and decent water,... Some folks still do tinker with some select mild nutes during bloom, usually PK booster to help fatten the buds more,... Micronute supplement is recommended no matter what, just in case,...