Heather Mack, 19, who denies any involvement in her mother's death, also alleges police on the Indonesian resort island have threatened to deprive her of food and water if she does not speak to them, her US-based lawyer Michael Elkin said in a statement.
He added that she was around two months pregnant.
However Bali police rejected the claims, insisting that all detainees were treated well.
The half-naked, battered body of Sheila von Wiese Mack, 62, was discovered on Tuesday last week stuffed in a blood-stained suitcase in the boot of a taxi outside the exclusive St Regis hotel in the upscale Nusa Dua resort area.
Police say they have strong evidence against the pair, and are leaning towards charging them with premeditated murder, which carries a maximum penalty of death in Indonesia.
However, Elkin has insisted claims that Heather Mack was involved in her mother's death are false.
"Said allegations and reports are not true and will be disproven as the investigation continues or at the conclusion of trial, if formal charges are indeed filed," he said in a statement.
In a statement sent to AFP late Saturday, Elkin said his client "has been seriously physically assaulted while in custody", without giving further details, adding that she has been "pregnant for approximately two months".
"Heather was told that if she does not speak to the police she will be deprived of food and water," the statement went on.
"Heather was told that unless her attorney arrives within days she will be deprived of food and water and that he will be denied access to meet with her," it added.
But Djoko Hari Utomo, police chief in the Balinese capital Denpasar, insisted: "All those detained here are well treated."
"I do not want to comment on something which doesn't even exist."
An FBI agent has travelled to Bali to help in the investigation, police on the resort island said yesterday. A doctor also revealed new details of the killing, including that the victim's neck had been broken.
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