By Dawit Endeshaw ADDIS ABABA (Reuters) -Kahssay Hailu sobbed, smiled and said prayers as she stood outside Addis Ababa airport, preparing to board a plane home to Ethiopia’s war-torn region of Tigray. She travelled to Addis Ababa in 2020 from the Tigray capital Mekelle to help her daughter prepare for a school exam. Weeks after her arrival, in November, conflict erupted between the federal government and the Tigray People’s Liberation Front (TPLF), the party that dominates the northern region. A shutdown in communications for much of the two-year conflict means Kahssay – like millions of othe…