Before that, she took on top jobs in the Northern Ireland parliament as minister for the Environment, Business, and just previous year, Finance minister.
Prime Minister Theresa May's Conservatives will fall short of a majority by winning 314 seats in the election, according to an exit poll.
Theresa May is set to visit Buckingham Palace today to ask the Queen for permission to continue in government, with the "understanding" that she has the DUP's support.
The DUP leader and former first minister Arlene Foster got a euphoric reception from her supporters inside the Titanic Centre in Belfast at about 2am on Friday.
Sinn Fein was the other clear victor claiming 7 seats.
"We fought this election on the importance of the Union and I think people really responded to that".
History shows that "alliances between Ulster unionism and British unionism have always ended in tears", Sinn Féin president, Gerry Adams has warned, after it emerged the Democratic Unionist Party will support the Conservatives.
The DUP gained two seats and their 10 MP's could now form part of a hung parliament. Adams said: "No. If we are fortunate enough to have candidates elected as MPs it will on the basis that we will not be going to take our seats in Westminster".