The 19-year-old, from Sprotbrough, breezed past Dutch star Aileen De Graaf in the final at the Lakeside Country Club.
Greaves, nicknamed Beau ‘n Arrow, did not lose a single set on her way to the final, defeating Lorraine Hyde, Paula Murphy and Rhian O’Sullivan.
She then secured a 4-1 win over De Graaf to seal back-to-back world titles and get her hands on the £25,000 winner’s cheque.
Greaves qualified for the Paddy Power PDC World Darts Championship, which starts this week, but turned down the invite in favour of defending her Lakeside crown.
Speaking after her victory in the final, Greaves said: “It feels great. It’s still really weird being stood here after the whole week is done. Fair play to Aileen, she’s a great player but I just got ahead at the right time. I enjoyed the game, and I’m just so happy to be stood here right now.
“When I went off in the break [after the fourth set] I told myself ‘I just need to get ahead now’ because I know what Aileen is like and she was going to bite on my ankles the whole way. My scoring was good, my doubles were ok, so I’m just relieved.
