Supposing she is a citizen of New Mexico, regardless of age, the following should apply to her:
NM Constitution
Art II, Sec. 6. [Right to bear arms.]
No law shall abridge the right of the citizen
to keep and bear arms for security and
defense, for lawful hunting and recreational
use and for other lawful purposes, but nothing
herein shall be held to permit the carrying
of concealed weapons. No municipality
or county shall regulate, in any way, an incident
of the right to keep and bear arms.
so im assuming NM is an open carry state?