AsNoriuanswered grow question 3 years ago Low temps or you are pushing girl to some unwanted condition.
You said you did flush and girl never finished cycle by getting dry.
It is very important to follow wet, dry, wet , dry pattern. All issues starts from that, pH, lockouts and stuff.
I was growing some time with pro mix, it's Coco based still soil mix, you have to let it dry.
Now colouring could be sighns of unhappiness or future issues, but at same time, they can change colour, go into funky ones, especially if any grandparents had those genes.
Hope you'll find your answer !
All the Best !