Congrats! You had more than your work cut out for you, with getting to work & managing the determined, multiple broodies with hatches. It's hard to figure out what was bothering the Buff broody to make her aggressive & not motherly; I wouldn't put her at the top of my "go to" broody list.
Thanks to all of the BYC'ers that give such good support & helpful info.
My broody "Blue" who just successfully hatched (1st time broody), is raising her 4 chicks that were from eggs up to 4 days apart, is doing a great job. I don't believe hatching would have gone so well if I hadn't put a cage up to her nest (when I heard egg peeping) to let her hatch undisturbed by the other jealous hens that were trying to push her out of the nest.
When the first chick was dry & standing, I then (at night) moved the broody, chick & the eggs (without turning them) to a dog crate with a box nest of straw, tiny chick waterer & chick food in a flat lid for the hen & possible hungry chick/s. This was sectioned off in the coop to keep others out & then the door was shut to keep her on eggs (my biggest worry); the door was opened a short while in the morning (before I left for work 5 days), then opened longer in evening (after home from work); this was to give her a chance to get out to do her business (but, she was very brief & seldom came out). She stayed on the eggs thru hatching & they are all enjoying the dog crate nest & sectioned off area in the coop.
She did all the work, but it was exhausting for me just trying to keep her safe & undisturbed, so she could brood successfully. Next time I will hold back eggs & put them back under the broody all at the same time removing any old eggs under her, so I don't have to interfere, except to candle eggs at 14 days & move hen with eggs to a sectioned off area with a dog crate nest (without shut door). Best wishes.