The president, ex-footballer George Weah, faced a second round of voting after October's election.
The targeting of Tapfumaneyi Masaya is part of a series of kidnappings of activists.
Kidal has been a bastion for the Tuaregs, one of the groups behind the political and security crises.
A former gynaecologist from Rwanda has gone on trial accused of genocide and crimes against humanity.
Bandy Kiki received threats after she came out as a young lesbian woman from Cameroon.
Just 7,100 votes separated incumbent George Weah and challenger Joseph Boakai in the first round.
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