Hey Shedrit, don't sweat it. She'll grow soon. I am not familiar with this strain but I am pretty certain she is still mainly working on the root side of things, sometimes they can take their time and leave the poor gardener wonder. Colours and the posture of the leaves seem normal, ph/ppm is good. Should be nothing you are doing wrong.
Can you see the roots of this baby? Only thing I could think of something weird going with the roots. But if they are all nice and white it should be ok. Meanwhile it sucks because there is not a thing you could do to help her at this point that I know of. Fiddling around too much might just be bad for her.