After several days of investigation, detectives don't believe documentable crimes occurred in the public battle between "Modern Family" actress Ariel Winter and her mother, a law enforcement source said.

L.A. County sheriff's officials have spent the last week probing accusations against Winter and her mother. They plan to submit their findings to prosecutors.

But the sources said they are doubtful any charges will be filed.

Winter's mother claims that her daughter's 18-year-old boyfriend had unlawful sex with the 14-year-old actress in her Montrose home. Winter is claiming her mother, Chrisoula Workman, physically abused her.

One source said it is clear the mother and daughter had a rocky relationship. But the source added: "There is no evidence of physical abuse."

The investigations began last month after a judge awarded temporary guardianship of Ariel, whose real name is Ariel Workman, to her adult sister, Shanelle Gray, also an actress. Ariel, through her sister's attorney, alleged in a court filing that she was subject to ongoing physical and mental abuse by her mother. 

Three days after Ariel took legal action to split from her mother, Chrisoula Workman reported on Oct. 6 to the sheriff's Crescenta Valley station that her daughter's 18-year-old boyfriend had unlawful sex with the underage actress.

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-- Richard Winton and Andrew Blankstein, Los Angeles Times