looks like slight burn to me. the tips are the first sign
some helpful info
Nutes? quantities and schedule?
soil?
have you checked ph?
do you moniter tds when you feed Nutes?
Its natural to see some yellowing during end of flower however that look more along slight Nute burn to me. I would start a good flush right away check all your numbers and make a gameplan from there.
dont stress to much they still are going to be great, props on secound grow looks overall very nice! keep up the good work. One thing i just noticed is your pot seems a bit small for that size ladies. what size is she in now?