If you have a microscope ...give her a look for spores. Ive had buds do this on just one branch. They appear dingy color compared to other buds. Its airborne and spreads like wildfire. If it is mold, you got alot of cleaning to do, and get some fungicide, Green Cure works great you can saturate the bud with it and its safe.
And some strains can give off weird smells that are nothing like they should be. I have a strain that I swear smells faintly like a dumpster sometimes, then at the end she really starts to have her strain specific smell