how many weeks are you into flowering? shes probably sucking up all the nutrients. you have any recent pics, i havent been around lately. also i never did soil test, if you have fox farm or something to that degree you should be fine through out. The tests i regularly do is runoff ph. just catch some run off and test it. Ill have to look up to see what you will have to do if its realllly low or too high. lol its been a while but stick in there. imo i think its just normal