Barty was bidding to become the first local woman to play in the Australian Open final in 40 years but it wasn't to be.
Critically, the French Open champion blew two set points in the first set tiebreaker, landed only half her first serves and committed 36 unforced errors.
“This really wasn’t an easy one, I’m just so thankful and grateful for this moment,” Kenin said in her on-court interview.
“I honestly can’t believe this. I’ve dreamed about this since I was five years old. I’m just so speechless.”