... that, and

soils have been dubious for a while now, many reports of badly off-pH bags.. talking low 5's pH here, some I have measured myself,... in any case she's hating that soil,... transplanting is a gamble, but staying in there is little better,... alternatively you could flush the hell out of that pot with water that/s around 7.0 or more,... First though, you should test the soil.. still have the bag? fix up a 1gal pot, and follow this test using the run-off and calculation method... it's not the best way, but this method in particular is an improvement,.. done wrong, r-o testing is very inaccurate,...
https://www.autoflower.org/threads/...-for-run-off-testing-and-ph-estimation.41733/