Dealing with a broody can be a challenge. You'll need to mark the eggs she's on and remove any new ones laid in the nest daily.
Do you have the space needed? Both for more chickens and she may need to be separated by wire from the rest of the flock.
Do you have a plan on what to do with the...
She's in a new environment, not used to you or the opening of the nest.
Are you positive she's broody, is she in the nest all night?
Is this your first flock?
Do you want a broody to hatch eggs?