Ok so "yellowing" leaves can turn back green. It's the "crispy" or "burnt" parts of that leaf that won't turn back green. Jorge's rule of thumb is pull the leaf off if it's 50% dead or more. I wouldn't defoliate an auto if you can help it, but using the 50% rule usually keeps down pests/diseases.
The newer leaves will turn a darker shade if they are up taking nutes like they are supposed to, even when given tiger bloom. If new growth isn't coming out yellow or contorted in any way, I'd resume feeding her
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