You know, I've been wondering about that - if you could put eggs that are almsot due to hatch under a hen that just went broody! That's really good to know. She's cute! I just hatched a little splash NN in my incubator. Love them!
That's what I did with Smokey's first brood, she got day 16 incubator eggs to finish up and brood. Worked out great for me.
The second time she went broody I had some eggs in the bator due in 14 days, so she got those to hatch.