Female heads of state is too broad an answer - that would leave out the Queens of the United Kingdom, Denmark and the Netherlands, and arguably the Governors-General of Canada, Antigua and
Even democratically elected female heads of state/ female heads of state in republics is too broad an answer - that description would also have to include this lady, currently in her second term and looking a bit uncomfortable in her ceremonial uniform:
So, who is she???
Edited to add: - See comments for the answer - alacsony got the country, and arwel_p named her correctly.