Does she fluff up and scream when you go near her, sometimes making a "cluck cluck" sound? Does she deflate herself and look like a pancake when no one's around? How much time does she spend on eggs? Does she spend the night with the eggs on the nest, if she's allowed to?
If she simply rolls the other eggs under her every time she gets in the nest box to lay, and leaves shortly after laying, then she's most likely not broody
If she is indeed broody, it will depend on your exact female weather or not she will accept the chicks. Some broodies need to be broody for at least one to two weeks before accepting chicks. Others will accept them right away. How far along are your incubator eggs? You could try placing then under her from now
Very early-on I learned not to trust breed disposition when it comes to brooding. It's one of those things a breed can't/won't guarantee. Every broody is different, and every broody attempt is different. Experience plays a huge role, even the same female won't be exactly the same in her first, second and third attempt.
Rather than worrying if your girl will make a good broody based on the breed's description, let your girl show you what she can do. If she is indeed broody, chances are she'll be a good mother