Calcium / PH issues? Did I take the correct steps?

It looks to me like several deficiencies at the same time... the first and third pics look to be a calcium deficiency but the second shows me a phosphorus deficiency as well. And the culprit for both is most likely your pH although since you don't provide info on the nutes you're giving, I can't rule out a nitrogen toxicity causing a lockout of those nutrients. Soil pH tests/meters aren't the way to go with determining what you should do here... you need to be measuring the pH of what you give her (both water and nutes need to be pH'd to between 6.0 and 6.5 with 6.2 being the "sweet spot") and then measuring the pH of the runoff which may be different - but not by much. l would recommend flushing your ladies out - so 9 gallons of pH'd water through each... into the last gallon, add 1/2 strength nutes and then let them dry out before giving any more water. I wish you had nute information for us as I could then perhaps suggest changes to the regime that would benefit the plant going forward - but in general, you need to increase the amount of P and K the plant is getting. The damaged leaves are not going to repair themselves but you should not see further damage occuring after a couple of days. Controlling the pH is the single most important thing you can do for your plants... maintaining a pH between 6.0 and 6.5 will allow the plant access to all the nutrients it needs for good growth. Good luck!

There are a few different deficiencies that make a plant get interveinal chlorosis and brown spots. So, i'm going to share a link with you that goes over all the major deficiencies and toxicities in the same article. Check out manganese deficiency. That is what this looks the closest to, in my opinion. https://dutch-passion.com/en/blog/a-visual-guide-to-cannabis-deficiencies-n987 If you're new here, please select the answer that helped you out the most by clicking on the "answer" button underneath what the person said. If you have any questions, feel free to message me on here. You can pull up your messages tab by clicking on the little airplane in a bubble. It's located on the bottom-right of your screen. I hope this helps!