Alright thanks , should i do that next water? Or the next.... 3rd watering?At first glance, I would guess deficiency. Now that you told us she just got her first feeding, i can see why. It appears as though the start of a magnesium and phosphorous deficiency could be the cause....
It's time to establish a feeding program. Start small, about 1/2 strength. I normally recommend starting with 1/4 strength, but your plant is older and should take the nutrients well.