Each hen seems to have her own component of broody skills, some just do a better job than others. Next time you may want to move the potential broody to her own place so she doesn't keep getting interrupted by the other hens. That might help her decide to stay broody until her chicks hatch. I move my broody hens in stages, and ALWAYS make their changes well after dark. If I can move both the hen and her nest box together I will.
First I wait a few days & nights to make sure the hen is really broody, that she wants to stay in the nest all day & night.
Then I'll move the hen (and nest if possible) to her broody pen. Some place cozy & secluded with enough room to get up and eat, drink & poop. Often it helps to shade the pen with something to make it nice & dim all day.
Since most of my broodies are bantams, I wait to see if she stays on the nest in the new pen, then I'll swap out the little eggs she's been incubating for others from my standard-breed laying hens. I don't want to make any more bantams for a while, but prefer larger chicks to hatch.