Soil ph

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.

Ashes, Diatomaceous earth or Lime. All the three are alkaline, so they may help You. DE has some silica and it's good against insects as well.

Raise your ph in soil I think most people use some sort of Lime. Mix it it to the top of your soil try not to disturb too much. Though please allow me to plug my nutrients haha buy Gen 1:11 next run our 5 part formula is ph balanced for both hydro and soil ;) just using normal tap water just mix and go :)