My mother recieved her green card 5 year ago and ready to submit her Citizenship application. In 2007 her husband passed away in Russia and she flew to Russia to conduct the burial services and to wait for a legal inheritance papers which by Russian Federation Inheritance Law “The certificate for the right of inheritance is usually issued by the notary public after the expiration of six-months.” She came back to US immediately after 6 months. In total she spend 6,5 months in Russia. Does this break a citizenship residency requirement and if yes, what supportive documentation would be helpful? I can send her husband's death certificate..