Ahhh that's brutal, looks like late stage botrytis, put a bag over effected areas and get rid off it carefully.
Try not to disturb it to the point of dust or the spores will spread to other girl's.... Sorry for the bad news
As stated above - remove all affected buds very carefully and dispose of carefully too
The rest may be salvageable .. good luck hope some makes it ok
If you have a fan blowing on the effected plant, the others are probably contaminated. If others show any sign at all of rot, you best plan on cutting early and salvage what is left.
Good luck
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