Don't worry about it, your plant will grow just fine.
I haven't checked my soil pH in 25+ years!
As long as pH is above 5.5 and below 7.5, your plant will get everything she needs from the soil. Trying to fix a perceived problem can often create more problems than what it was you are trying to fix in the first place. Adjusting pH in soil can only be done slowly, so slowly that your plants will actually be finished before reducing the pH to a stable 6.8 and not worth the bother.
Flushing your soil with vast amounts of water will just leach all the nutrients from it, upset your soil microbes immensely and lead to a sterile substrate that will need constant fertilizing to make your plants grow.
Hope this helps,.......
Organoman.