The WHO said the Ebola death toll rose to 4,922 out of 10,141 known cases in eight countries.
At least 115 people, most of them South African, died when a church building collapsed in September.
An MSF doctor has contracted the virus.
In a statement, Mali's government confirmed the death of the girl, who has not been identified.
Governors Andrew Cuomo and Chris Christie want those who enter the U.S from West Africa to be quarantined.
Prime Minister Stephen Harper and his Conservative colleagues scrambled to beef up anti-terrorism legislation.