Your mother will have a five year (four year, 9 month, technically) wait to apply for citizenship after being granted permanent resident status. However, there are rules regarding physical presence prior to applying for naturalization. She may file a Reentry Permit before she begins extensive travel time outside the US, but you are going to want to fully review her plans with an immigration attorney.
Answered on Mar 05th, 2013 at 5:02 AM