If your mother is out of the United States, as a lawful permanent resident, for more than six months then this could possible trigger a bar to her reentry. DHS/ICE could argue that she abandoned her residence. However, abandonment cases hinge on intent, that is, did your mother intend to abandon her residency status? Anything beyond a year is definitely problematic. Six months or more is also questionable.
Answered on Jun 28th, 2012 at 2:49 PM