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She is looking more than healthy, PH is actually something you really don't need to care about, just grow with a living soil and the ph will fluctuate itself with the living Micro-organisms and bacteria. She is healthy don't overthink things, sometimes you can just make things worse

Just use less nutes. The pH dropping like that is usually caused by the plant taking in more water than nutes which means you're feeding too much. Go with just water for a couple feeds and it should go back up.