Wow she looks gorgeous Top job my friend well done ! That is completely upto you though some growers will argue not to flush your plants at all. I would say just use normal water at a temp of around 24 degrees this helps break the salts down so she can consume them quicker. Though this is my opinion she will take up any nutrients you give her and continue to mature and ripen so you will have a much denser and more potent nug if you continue to feed her but you may end up with slightly harsh bud before the cure. Though even cannabis experts cannot identify flushed cannabis vs non flushed after the cure because the difference is very very slight. Though I will leave this decision in your trust worth hands great job you should be a proud Dank Daddy :) Keep up the great work bro !