* Refugee will need months of treatment, doctor says
* 2014 UN appeal is only 14 percent funded - UN official
* Refugee crisis is challenge to Lebanon's new government
By Yara Abi Nader
BEIRUT, April 2 (Reuters) - A U.N. official said a Syrian refugee in Lebanon who doused herself with petrol and set herself alight after her aid was cut was a victim of a lack of funding for the world ...