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My first glance I thought it was trichomes but the picture is too blurry to tell.
It doesn't hurt to treat those patches for mildew, just in case. Especialy if she has a few weeks more to go. Wipe instead of spray the leaves, to avoid getting anything on your buds.
I have had over-lighting issues, Along with bleaching the tips can also get crispy, and the leaves might curl, and buds foxtail.
Recently a grow stretched surprisingly tall leaving some colas 6" from the COBs. Those top buds grew very weird flat tops but for some reason there was no bleaching that time.