She was joined by European Council head Donald Tusk and European Commission Vice President Frans Timmermans, who were greeted at the airport in south-east Turkey by Prime Minister Ahmet Davutoglu.
The delegation was set to travel immediately to a refugee camp in Nizip, near the Syrian border, where they were expected to speak to some of the 5,000 or so people forced to flee their conflict-wracked country.
In exchange, the EU has promised Turkey some six billion euros (USD6.8 billion) over the next four years aimed at helping Turkey better conditions for the 2.7 million refugees it is hosting, as well as a conditional offer of visa-free travel for Turkish citizens.
