droopy leaves, need help

hey, iv got superskunk witch are 40 days into flowering. my biggest girl is having problems first i noticed all the tips of the leaves looked like they were burning, and i moved her away from the light more and it was still happening so i was told it was nutt burn so iv been flushing her and now the top leaves are starting to sag, heres some pics of her.

It's impossible to diagnose without knowing what your medium , nutes/strength, temps, pH... is,