The purpose of a trial is not to test the defence.
The purpose of a criminal trial is for the prosecution to prove, beyond reasonable doubt, that a criminal offence has been committed.
A person may choose to put a defence in; they may choose to simply pick apart the evidence of the prosecution to put doubts in the minds of the jurors and therefore not meet the burden of proof (beyond reasonable doubt); they may choose, in rare cases, to do neither and let the prosecutions evidence speak for itself.
And just to pre-empt: this woman may never stand in the dock and give evidence/be crossed examined. It will be a tactical choice of her legal team - will her giving evidence be beneficial to challenge the burden of proof?