What did the rooster do? Roosters are always the least of my concerns with broodies and chicks. It's the other hens that cause issues, or Momma herself.
Yeah, I'd just open her pen and let them mingle.
I usually have my hens raise their chicks in the main flock. But this year, and over achieving barn cat started taking baby chicks, so broody mommas and chicks went into a secure pen until chicks were about 5ish weeks old. At that point, I just...