Help me help her?

Like below I believe it to be over watering. Also check your pot weight. If its heavy it has water in it for the plant to use. Let the pot go dry and let the plant droop a bit before watering again. The dry cycle will allow your roots to reach and grow to find water. The roots is how your plant absorbs nutrients so bigger rots bigger fruits as they say. The plant will tell you when to water it with the droop. Water to slight run off then leave it alone until it tells you to water again with the droop. Repeat. Depending on the size and stage of your plant frequency of watering will change. Level to the ground leaves are happy plants. Reaching for the lights are also happy plants. Just remember that just before lights out the plant may droop as it gets ready for the night cycle.

It seems like a bit of overwatering to me too. Insert a finger into the earth up to at least 3cm. If you feel even very little humidity, don't water, wait the next day and repeat. It depends on humidity and temperature, sometimes I don't water for up to 5 days.

There is absolutely no problem with your grow and it is preferable to the grow tens tona lighter green colour than dark green. From what I am seeing you should start to move you grow to the final pot. All things are OK, but perhaps avoid irrigation on the amount that you are using it will be a very wise step and mostly the plantula (the phase were you are right now) is already OK to move it to the final grow pot. Big hug. Keep up the good job. 420 always

i reckon she needs a complete feed including npk as well as iron magnesium and calcium

Overwatering. The yellowing tips and edges will simply die off. The leaves themselves will just become pale. Let her fully dry out and most leaves will regain their colour. Also the dropping is most often overwatering in the early stages.