I agree. She will care for them until she is ready for them to be on their own.
You have another decision to make. Do you let mama raise them with the rest of the flock or do you keep them isolated from the flock? If you let mama raise them with the rest of the flock, you don't get the integration issues you could otherwise have. However, mama needs room to do her job. If she can keep her babies from being underfoot, what will normally happen is that another chicken will peck a baby, mama will immediately severely reprimand that chicken, the lesson will be learned, and things stay peaceful. If space is tight enough that mama cannot keep her babies out of harms way, however, bad things are more likely to happen.
Good luck!