In the recording obtained Tuesday by The Associated Press, the panicking woman tells the dispatcher that her mother has collapsed.
Listen to the 911 call.
A few seconds later the woman says her mother is breathing and appears to be conscious. The caller is not identified. Woods' wife, Elin, has a twin sister and it is not known if she is also staying at the house.
Barbro Holmberg was taken by ambulance to Health Central Hospital with stomach pains. and returned to the mansion. The 57-year-old is a Swedish politician.
More on Tiger Woods:
Is Tiger Woods a Sex Addict?
Meds Involved in Tiger Woods Accident?
Elin Nordegren Moves Out
Police Sought Blood Test for Woods
Photos: Tiger Woods
Photos: Sports Sex Scandals
Photos: Elin Nordegren
Tiger Woods: I Let My Family Down
Parnevik: I Thought Tiger was a Better Guy
Tiger's Alleged Voicemail Message
Health Central is the same hospital where Woods was treated after he crashed his sport utility vehicle outside his home in the gated Isleworth community in Windermere last month.
A hospital spokesman said Holmberg had been in a private room and the family had hired additional security to keep the media away. He said family members visited, but he would not say which ones.
In other news, Woods' wife has had enough of the alleged affairs - now as many as 10 - surrounding the golfer , celebrity Web site Radaronline.com reports.
As more women surface, claiming to have had an affair with Woods, Nordegren has moved to a nearby home, also owned by the golfer, Radar reports.