Although brief, it was a useful outing for Kvitova, who once more hit the ball with pace and accuracy with her ground strokes.
"She's such a great chick and I love playing on court with her".
"We both started well and I served particularly well in that first set and I think it gave me the upper hand".
"I like to play finals on grass".
Her last final on grass had been her triumph at Wimbledon three years ago against Eugenie Bouchard. "This is what I fought so hard to come back and play tennis for".
Serving for the set, the Czech suffered an attack of nerves as two double-faults enabled Barty to claw one break back, but that was not enough as Kvitova served out for the set at the second attempt.
Remarkably, she's playing only her second tournament and only her sixth match since she was attacked in December.
Barty continued her impressive run as she qualified for the WTA event in Nottingham and reached the quarter-finals.
Kvitova then stepped up her game, racing out to a 5-1 lead in the second set and dominating in the decider to take the title after one hour, 47 minutes.
And, to cap off an incredible tournament for Barty, she will partner Casey Dellacqua in the doubles final against Hao-ching and Chan Shuai Zhang. "I was very happy with my performance".
Ashleigh Barty is coming off a three sets win over Garbine Muguruza that took 28 games to decide. Kvitova has won five of her last seven matches on grass court. She recovered from 5-3 down in the final set to beat Daria Gavrilova of Australia 6-7 (4), 6-3, 7-6 (5). "I wanted to play my best which I showed today and I hope I can keep doing that", she added.
With her confidence growing, Kvitova was in full flight, producing an increasing volume of winners and breaking the Australian in the first game of the third.
"I don't think you can find any tennis player at all who isn't happy to see (Petra) back and genuinely pleased she's back on tour and being successful", Barty said.
Federer, who skipped the claycourt season after winning the Miami Open in early April, claimed his fourth title of the year, matching Rafael Nadal's tally, and he will be seeded ahead of his Spanish rival for Wimbledon, which starts in eight days.