Is she prepared to give evidence on oath?

她愿意宣誓据实作证吗？

《牛津词典》

An appellant is usually given a choice at the hearing of either making an unsworn statement or alternatively giving evidence on oath in support of this appeal.

进行聆讯时，上诉人通常可选择不宣誓作供或宣誓下作供以支持其上诉。

youdao

Notwithstanding any law or practice to the contrary, it shall be lawful for, the court in any proceedings for an offence under Part II comment on the failure of the accused to give evidence on oath.

即使任何法律或者惯例有相反的规定，在因第ii部所订罪行而进行的法律程序中，法庭可就被控人不宣誓做供一事加以评论。

youdao

The investigation will cover possible offences of manslaughter, perverting the course of justice by changing police statements, perjury by officers who gave evidence on oath, perverting the course of justice by misleading journalists and misconduct in public office.

BBC: Hillsborough inquiry staff recruited by IPCC

Two additional charges allege perjury in respect of a statement given to his solicitors and also lying on oath in evidence he gave to the trial.

ECONOMIST: The