In her first major interview since she assumed charge at Downing Street in July, she told BBC that Brexit will not be "plain sailing" - but that she remains optimistic.
"We have had some good figures and better figures than some had predicted would be the case. I'm not going to pretend that it's all going to be plain sailing. I think we must be prepared for the fact that there may be some difficult times ahead. But what I am is optimistic," she said, insisting the UK will "make a success" of leaving the EU.
She also ruled out a snap election, saying the UK needs "stability".
The prime minister said she wanted "an independent Britain, forging our own way in the world".
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According to her, the referendum result had shown voters did not want "free movement to continue in the way that it has done in the past".
"People also want to see the job opportunities, to see the economic opportunities, and so getting a good deal in trading goods and services is also obviously important for us," she added.
She said the government will not trigger Article 50 - which will begin the formal two-year process of leaving the EU - before the end of this year.
However, she added: "I'm very clear also that the British people don't want the issue of Article 50 being triggered just being kicked into the long grass because they want to know we're getting on with the job of putting Brexit into place and making a success of it.
Britain's economic growth last month had picked up speed in the second quarter, but economists have expressed concern about the longer-term impact of Brexit.
Two months on from the vote, the relationship the UK will have with the EU after its exit, in terms of access to the EU internal market and obligations in regard to freedom of movement, remains unclear.
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