Well, it turns out that I had a piece of SHIT PH reader...one of those aluminum soil probes. Bought a new PH reader today, OH MY GOD!!!! Her PH was at 5.2!!!!! The other reader said 6.3
Hopefully I have remedied the problem before she went downhill

I flushed her again and got the PH to 6.4 Keeping my fingers crossed. She is only 23 days flowering, so should be okay after a bit.