Give her some eggs from the 'bator? Maybe 2. Chickens can't count....then you can stuff all the chicks under her when they hatch and you won't have brooder dust all over the place.
I got one more chick today and it isn't thriving. Going to give them till tomorrow night then start candling or try water testing them. I moved the broody again tonight, this time putting her in the nest box from outside rather than inside the coop and made sure she was pressed down on the golf balls before letting go. If she sticks in there, I'll give her some chicks. The chicks hatched 1 Friday night, 6 Saturday. Do you think they would still take to the broody Monday night? She is a first timer and only solid broody since Thursday.