Danny is correct. Atlanta is covered for Cricket's customers living and residing in the original Cricket markets. However, the 50/50 rule will apply. If she will be living in Atlanta full time, she will definitely fall under that rule and will be subject to service restriction or disconnect. This is actually the same rule all four major carriers have. If the new Cricket Paygo phones become available in Atlanta, then there will be certain terms and conditions associated with their usage as well. You would need to consult the packaging and included materials for further details.
Thanks
Shorty