What’s the problem with my girl here? I am think...

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There's way to much N in that plant. Don't flush. You can jst feed water and an enzyme (0EC VALUES) and add these the plant will show you. Or just start back feed in 7-10 days. Depending on her uptake and so on.

Flush her and go down with the pH. I would suggest it's an nutrition imbalance. After flushing feed her with a bit less and with pH adjusted water (~5.8 with coco)

overfed.. possibly an imbalance could cause a coinciding deficiency... definitely need to tweak formual next time or this will re-occur. if you use coco, i'd suggestion sticking to typical soilless methods. you need a complete and full diet in every irrigations at around 1.3-1.5EC. Start near 1-1-2 weighted ratio for NPK and 4-2-1 for K-Ca-Mg. You need all the nutes regardless of classification and primary secondary or micros etc... meaningless categories in regard to physically applying fertilizer as it is all needed at all times. Always 10% runoff waste and don't let it sit in that piss. 6.5pH is perfectly fine and won't cause what you are seeing. If it is consistent, you can work with it just fine. Would a bit more acidic produce 5% more weed? maybe, maybe less than 5%, as it's a small effect when you read the research relative to common sense ranges of pH that don't cause catastrophic problems of any kind, which 6.5 definitely is safe in that regard. 6.5 will not lock anything. You may need a slightly different ratio of nutes but small variances compared to someone with pH near 6.0 or even 5.8. you go too low and you quckly lock out Ca and do see all sorts of problems at normal ratios and concentrations of nutes that should work. These ratios are loose concepts. Trial and error required to properly tune to your local environment (lights, temps, substrate evrything). If you use products with less known quantities of nutrients, like a soil grow would, you need to treat coco like a soil grow. If using forms of nitrogen that are not plant ready, you need a lot more of N than the ratio above (1-1-2 - 2-1-2), because there's a 'production line' in your substrate that must occur before it can even enter the plant. You can google "optimal npk ratio" "optimal K Ca Mg ratio" and find research that supports these numbers. these are not homebrewed things from uneducated (not their fault.. skill differentiation in a complex society makes it impossible for 1 person to know all, so some sources are far better information than others) people growing 2 plants in their laundry room. Could be high in N or Mg as both cause really dark leaves. These things being too high can cause availibility issues with other nutes... so you need to clear up the buidling toxicity before you can 100% confidently assess the symptoms you see as being caused by what our leaf charts tell us. (find a leaf chart! lol) in the end.. insufficient info, but if you can use deductive reasoning and common sense extrapolations from the above to systematically refine your fertilization methods, you'll do fine. Quit going to sites like this for detailed information, lol.. marijuana sites are rife with nonsense.

6.5 is very high for coco buddy pretty sure thats the problem you want coco at around 5.5 to 6.5 the sweet spot being around 5.8 then you chould be okay :)

This is beginning of leaf burning from nitrogen toxicity/over feeding. Next grow use cannabis specific fertilizers, general garden vegetable fertilizers are not really suitable for proper health in cannabis.