hi mate, considering how dark green your leaf is in the picture i would say its nute burn. Give her just water for the next couple of weeks, ph 5.5-6 see if she improves. Also, they are drooping a little so be careful how much you water them, wait until completely dry if using mineral nutes, nearly dry if using bio nutes. hope this helps but i am still learing myself so i could be wrong. good luck