Gulbis, tied for the 54-hole lead, stumbled to a 10-over-par 82. She ended up tied for 29th. She bogeyed four of the first eight holes to fall away.
"I mean, I played really bad," Gulbis said. "I did a combination of all the bad things a golfer can do."
Gulbis, 30, was looking to add to her 2007 Evian Masters win. She said Saturday night that she thinks about how long it has been since she last won every time she practices.
Gulbis said she couldn't find her swing right from Sunday's start.
"I didn't hit it well on the range," Gulbis said. "If you mis-hit shots on this golf course, it will really get you fast."
Michelle Wie, three shots back at day's start, couldn't make a charge in her bid to win her third LPGA title, her first in three years. She shot 72 and tied for 11th.
Lexi Thompson, looking for her third title in five starts, struggled in the wind. She started the day two shots back but shot 76 and tied for 16th.