MarcXLanswered grow question 5 years ago Reddish means when there is some red color apperaring on stems and leaves veins. Happens often, due to genetics. If no other problems appear, it´s all good.
When doing defoliation, you want to get rid of all stuff in the lower third of the plant, leaves and buds for focussizing the energy to the top buds.
In your late flower it´s too late to cut popcorn buds, but getting rid of old yellow leaves is always a good idea. You also can cut off bigger healthy leaves at 2 weeks from harvest to lower her nutrition reserves so she can consume her remaining reserves faster.