Hi, if you are having such along growtime, its always good to do a Flus, a very good one with lukwarm water. If you are growing so long there are sltbuidups hanging on the roots and blocking new nutrients. The soil is getting very dense and its tough for the roots to handle. Give her anice flush to flush away old builitups and give oxygen to the roots.. she will love it. Aftr the flusing you can start new: that means give her nutrients and beneficals ( living organics, bacterias, molasses) to enrich your soil. Iam sur your girls will shine soon again