JAKARTA (Reuters) - A United States teenager detained in Bali in connection with the grisly murder of her mother was due to be questioned for a second time on Friday after so far refusing to answer questions, the police said.

Heather Mack, 19, from Chicago, and her boyfriend, Tommy Schaefer, 21, were arrested on Aug 13 as suspects in the death of Mack's mother, Sheila von Wiese-Mack, 62, whose battered body was found in a suitcase in a taxi outside the resort island of Bali's luxury St Regis hotel.

"There were no results from the first examination because she refused to answer any questions," said Bali police spokesman Hery Wiyanto, adding that Mack underwent more psychological tests this week.

Mack has hired a new Indonesian lawyer, replacing a police-appointed legal representative.

An official at the hospital that conducted the autopsy on Ms von Wiese-Mack said she had been repeatedly hit on the face and head with a blunt object.

Mack and her mother had a troubled relationship and Ms von Wiese-Mack had frequently reported that her daughter punched and bit her, according to police reports cited by Chicago media.

Ms von Wiese-Mack's husband, and Heather's father, was classical music composer James Mack, who died in 2006.

The two suspects have not been formally charged with a crime. Under Indonesian law, charges would follow an investigation that could take weeks.