Don't you think if you reduced it to less than 8 eggs she would be able to hatch them all on time without any struggling and with a lot less hassle?
Just the day before yesterday my broody silkie hatched 6 coturnix eggs for me. It's the second time I've hatched them with a silkie. Last time I did 6 too. I probably could have done up to 10, but even with 6 she kept leaving eggs behind or getting them stuck under her legs where it isn't as warm. I had to check on her daily and move any cold eggs back under her. I'm sure that would have been a bigger problem with more eggs. Still, they all hatched on day 17 and are very healthy and energetic.
I really like hatching them with silkies, since they can free range together while they are little.
With chicken eggs, my silkies will TRY to sit on as many as they see (the first time almost 20!), but they can't do more than around 4-7. When they've tried more than that, some are cold. Then the eggs don't hatch on time and the ones that do hatch sometimes die suddenly. I've had much more success limiting them to fewer eggs: healthier chicks and chickens, closer to 100% hatch rate, on time hatches, etc.