Flushing

If you flush properly, you should have LOTS and LOTS of runoff... a flush is considered a flush when you've run 3x the pot volume of pH'd water through the pot... so if they're 3 gallon pots, you'd need to run 9 gallons of water through her - yeah, there should indeed be runoff! But if you're doing a slow, end of the grow flush, then there should also be some runoff - but that type of flush is done simply by giving her only water for the last week or so... If one lady isn't drinking anything, you may have some root problems or she may have been reacting to the high pH... If she's close to harvest but not harvestable yet, I'd just let her be... no need to harvest her early and don't give her any more water. Good luck....