Hi, I need help, some leaves turned yellower than others, and the lower ones began to die off, did I notice this 2 days ago?

She looks healthy to me! It’s normal for yellowing dying leaves at your stage of the grow. Maybe raise your ppm so she can take on the correct amount of nutes she needs. You can google a good PPm chart to read but 1200 is probably good for where your at. I always still feed a small Amount of base grow with my bloom and boosters but not a lot. Other than she may be a little hungry she’s a beauty.! Hope you get the results your looking for Peace love and grow my friend!