From one of the ealier posts by "MainBheeCitizen " (
http://www.immigrationportal.com/showthread.php?t=173229) .....
"I beleive:
(1) Physical presence of 30 months needed ONLY between Green Card Date and date of application.
(2) Continuous residence needed at all times (even upto the day of the citizenship interview).
As per the law (INA Act 316) - note the contents of (1) and (2)
No person, except as otherwise provided in this title, shall be naturalized, unless such applicant, (1) immediately preceding the date of filing his application for naturalization has resided continuously, after being lawfully admitted for permanent residence, within the United States for at least five years and
during the five years immediately preceding the date of filing his application has been physically present therein for periods totaling at least half of that time, and who has resided within the State or within the district of the Service in the United States in which the applicant filed the application for at least three months, (2) has resided continuously within the United States from the date of the application up to the time of admission to citizenship, (3) during all the periods referred to in this subsection has been and still is a person of good moral character, attached to the principles of the Constitution of the United States, and well disposed to the good order and happiness of the United States."
So, the way I see it is, physical presence is not an issue as long as one meets the continuous residence requirements (i.e. no trips longer than 6 months).
I mean it shouldnt be more than 6 months at a time as all the requirements of physical presence and no trip more than 6 mos should be satisfied till Oath. Small travel trip shouldnot be problem. She will need to mark Yes on the back side of the Oath form (they will give that to her with oath invitation) where they ask to see if you have made any trip outside the US. That's it.