I wouldn’t start a blind “2-week flush” just because it’s day 100. The plant doesn’t read the calendar 😅
If the calyx trichomes are still mostly clear/cloudy with no amber, she simply needs more time. From the photo she looks healthy and still capable of finishing, so I’d keep feeding moderately rather than suddenly starving her. I’d also avoid hammering her with PK this late — more isn’t automatically better.
Watch the trichomes on the calyxes, not sugar leaves, and look at overall flower maturation. Once you’re seeing mostly cloudy with the amount of amber you want, you’re in the harvest window. Yellowing/fade can happen, but it isn’t a requirement for ripeness.
Also, a long pre-harvest flush isn’t necessary for producing clean-burning flowers.