Looks like over watering, and maybe the start of a deficiency.
I may be wrong. lol
I thought perhaps over watering, but when I've seen over watered plants before, they've looked droopy and limp like this picture I found from google.
Mine on the other hand, look sturdy and strong, but for the curl on the upper fan leaves, which can be seen below.
The deficiency side I can go with, however, I am not entirely sure what deficiency it could be. I'm leaning more towards Calcium or Magnesium personally but I guess we'll see how she develops.
Anyway, I gave her a drink with fresh tap water which had been left to run before I bottled it up and left it for 4 hours to raise the temperature to room-ish temp.
Hopefully it will either work or help diagnose what the problem is. She's still growing well and she's super stinky too, it's like super sweet kush blend, it's very very pleasant. I'm getting to that stage where I just want to pick buds off but I must resist as it has a long way to go yet! Lol.