My daughter just started growing plants and she has two indoor pepper plants that are sitting on the north facing window ledge and they are dropping leaves like crazy. She sent me a few photos and on one plant that has a pepper, it has almost lost all of its leaves while the other one is still hanging in there. It's watered daily and she said the soil is damp, they are in smallish pots and she has feed it once using the shake and feed fertilizer. Any idea's why her leaves are dropping? Over watering?