like said, flush your soil - like watering a two times with a lot of drain each time,
then you have a clear start point on this front,
when your temp and % is ok then it takes 2-3 days to dry it ,
change her position to less light - then she has less work to do while recovering from overfeeding.
Then you can start with half doses again - 2 times than 1 time just water. In this way you cant overfeed so hard again. best wishes.
When you give to much (not each time !) and she has to transpire a lot - she gets to much - and no lock or deficit - its to much and not to less.
If there is a deficit then allways the lowest and smallest leaf is the first which shown signs of losing colour and get cannibalised by the plant and fells off .
if it is to much then it can be anywhere.