Barbro Holmberg was taken by ambulance to Health Central Hospital with stomach pains after a 911 call from Woods' house. Holmberg, a Swedish politician, was released about 11 hours later and returned to Woods' mansion, hospital spokesman Dan Yates said.
"She was wheeled out in a wheelchair just like everyone else," Yates said.
In a recording of the 911 call obtained Tuesday by The Associated Press, a panicking woman tells the dispatcher that her mother has collapsed.
"Hurry up," the woman says as a child can be heard crying in the background. "She collapsed in the bathroom. What do I do?"
A few seconds later the woman said her mother was breathing normally, talking and didn't appear to be hurt from her fall.
The caller wasn't identified. Woods' wife, Elin Nordegren, has a twin sister, but it wasn't clear whether she was at the house.
Health Central is the same hospital where Woods was treated after he crashed his sport utility vehicle outside his home in a gated community in nearby Windermere in December.
Holmberg, 57, arrived in the U.S. a few days ago, Yates said, just as her daughter grappled with fallout from the crash and the ensuing statement from Woods that he had extramarital "transgressions."
Woods and his wife have a 2-year-old daughter and an infant son.
Family members visited Holmberg in the hospital, Yates said, but he did not specify whether Woods or his wife came. The family hired additional security to keep the media away.
Yates would not speculate on what caused Holmberg's stomach problems or whether she had suffered previously with that type of distress. Holmberg's spokeswoman, Eva Malmborg, said she wasn't aware that Holmberg suffered from any disease.
Holmberg was expected back at her job as Gavleborg county governor in central-east Sweden next week, said her deputy, Olov Rydberg.
Intense media scrutiny has followed the world's No. 1 golfer since he hit a hydrant and a tree Nov. 27 about 2:25 a.m. Woods was cited for careless driving and fined $164.
The attention didn't let up Tuesday, when dozens of live trucks, camera crews and reporters camped out on the hospital's lawn, awaiting word of Holmberg's condition.
The accident -- and Woods' refusal to answer questions about it -- fueled speculation about a possible dispute between him and Elin.
Just days before the crash, a National Enquirer story alleged Woods had been seeing a New York nightclub hostess, Rachel Uchitel, who has denied it. After the crash, Us Weekly reported that a Los Angeles cocktail waitress named Jaimee Grubbs claims she had a 31-month affair with Woods.
Last week, Woods issued a statement saying he had let his family down with unspecified "transgressions" that he regrets with "all of my heart." He did not elaborate.
A police report released Monday showed that a Florida trooper who suspected Woods was driving under the influence sought a subpoena for the golfer's blood test results from the hospital, but prosecutors rejected the petition for insufficient information.
A witness, who wasn't identified in the report, told Trooper Joshua Evans that Woods had been drinking alcohol earlier. The same witness also said Woods had been prescribed two drugs, the sleep aid Ambien and the painkiller Vicodin.
The report did not say who the witness was but added it was the same person who pulled Woods from the vehicle after the accident. Woods' wife has told police that she used a golf club to smash the back windows of the Cadillac Escalade to help her husband out.
RUNNING ON EMPTY
Gatorade's "Tiger Focus" will be discontinued, the company confirmed to CNBC on Tuesday.
The decision had nothing to do with recent events surrounding Tiger Woods, but more to do with a strategy devised months ago to streamline their offerings. The company said the decision was made "several months ago."
Meanwhile, commercials that feature Woods have disappeared from television since his SUV accident Nov. 27 unleashed a flood of reports about his possible marital infidelities, Bloomberg reported in a story published Tuesday.
-- From Wire Reports