She told friends she is now unsure about the divorce because of her strong religious beliefs and because Schwarzenegger is trying to win her back, the report said.
The former California governor has been "extremely sweet" to his estranged wife, buying her presents and making other nice gestures, according to the gossip site.
Shriver, who has four children with the actor, filed for divorce in July citing "irreconcilable differences" after it emerged that Schwarzenegger fathered a child with a former household staff member.
Soon after filing for divorce she bought a $10 million Los Angeles mansion in the swanky Brentwood neighborhood, not far from the family home she shared with Schwarzenegger during their 25-year marriage, TMZ reported.
She is seeking spousal support and requested Schwarzenegger pay her attorney's fees in what could be one of the costliest celebrity divorces ever.