Weather was a key factor Sunday, and Webb, who shot 33 on the front nine in tough conditions, knew that the others' inexperience would be a drawback.
Yesterday, you know, I asked for a little bit of bad weather today and I got my wish for about five or six holes, I guess, she said.
More from Webb on her sixth major win.
The LPGA veteran started the day three strokes off the lead set by 23-year-old Jenny Rosales and Carin Koch. The Aussie quickly made up ground, carding three birdies through the sixth while both Rosales and Koch struggled with their games.
Heading back to the clubhouse, Webb had her own struggle when she was informed her group was on the clock for slow play.
Fortunately, I kept things going and obviously made a great par save at 16, which really was a big key and then birdied 17, which I didn't know at that stage, but probably put the last nail in the coffin, she said.
Webb finished the day at 15-under, having recorded a final round 6-under 66 on a day when others struggled just to stay under par. She earned her sixth major championship over the last five years.
This was the last title the former two-time Weetabix champion needed to complete the 'Super Grand Slam.' This accomplishment is achieved when a player has won every major within his or her playing career.
Webbs former wins at this event did not count towards the 'Super Grand Slam' since the Weetabix was not officially a major until 2001.
I don't think it's still sunk in yet, the three-time British Open champion said. I knew that coming into this week I did have a chance to win all five majors on the LPGA. It feels great. It's not a feat that everyone has a chance to do.
Fiery Spaniard Paula Marti tried to put the heat on Webb all day, but the best she could manage was a second-place tie at 13-under 275 with Australias Michelle Ellis. Candie Kung, Jeong Jang, Catrin Nilsmark and Jenny Rosales finished tied for fourth place at 11-under 277.
Former U.S. Open champion Meg Mallon had a great day, shooting 70 to finish at 10-under 278. She tied with 17-time AJGA winner Beth Bauer and Koch.
Koch, still without a major win to her name, disintegrated on the back nine, making consecutive bogeys on the 12th and 13th and finishing with a disappointing 2-over for the day.
Marti insured herself a spot on the European team for this year's Solheim Cup with her spectacular display of golf on Sunday. Marti recorded four birdies and a sole bogey on the 379-yard, par-4 13th after missing the green left and leaving her chip shot six feet short of the hole.
It was tough out there today, I can tell you, said Marti, who had never before shot four consecutive rounds in the 60s. The first three holes it was blowing and it was raining a lot. I just told myself to be patient. And, as you can see, I made, like, seven pars in a row. Andy (my caddie) and I, we were just so patient on the course today. I knew I was putting good and I knew I was playing good. I knew the birdies were coming, so I just needed to wait and don't rush, and that's what I did.
For Marti, who will join the LPGA Tour in the near future, Sundays second-place finish was a turning point in her career.
I think I just showed myself that I can play with the big ones. So if I can do it here in Europe, I can do it in America. That gives me a lot of confidence in my game and I'm going to go for everything now, she said.
Marti has two wins on the Evian Tour.
Ellis has finished third twice this year on the AustralAsian Tour, yet doesnt have a single top-10 finish this season on the LPGA Tour. Her previous best finish on the LPGA Tour was a tie for 11th at the Areus Electrolux.
In all, she made seven birdies - two on the last two closing holes - and three bogeys to record a final round of 68 and come within two strokes of Webb.
Karrie is a great player and to be up into her category and looked at in her category is pretty awesome in itself,' Ellis beamed. 'But we all strive to beat Webbie and Annika. And that's what we're out there to do. I love Webb to death, but she is a rival when we get out on the golf course.
Final results from the Weetabix Women's British Open