At this late stage and especially now that your plant is flowering, I would not be worrying about it too much and just leave her undisturbed to finish maturing.
Doing anything radical, to fix a perceived problem, even if it is not really a problem, can cause more damage than just leaving it alone.
Your plant will not grow any differently if the pH is 0.2 either way of some sort of theoretical "ideal".
I have not checked the pH of my soil mix for the last 30+ years and as long as you don't go dumping huge amounts of imbalanced fertilizers, you shouldn't have any problems or any noticeable difference in the quality or potency of your buds.
Growing is about fun, and should not be an exercise in some sort of theoretical "perfectness" or "exactitude"!
Hope this helps, Organoman.