The results sent Costa Rica to a two-leg playoff against the winner between Panama and Nicaragua on December 7 and December 11 for the second and last Central American berth in the eight-team finals field.
Karolina Duran scored once in each half on Wednesday to lead Costa Rica to a 2-0 victory in Heredia, Costa Rica.
Costa Rica reached the semifinals of the CONCACAF U-17 Women's Championship in both 2008 and 2010.
It waited Sunday to learn its opponent in the playoff between Panama and Nicaragua. Panama won the first leg of its series against Nicaragua 6-0 on Wednesday and travelled to Managua on Sunday for the return match.
North American sides Canada, Mexico and the United States along with host Guatemala already have qualified for the May 2-13 finals.
The three Caribbean berths will be this coming week when the Bahamas, Guyana, Jamaica and Trinidad & Tobago face off in Kingston Tuesday-Saturday in the final round of regional qualifying.