Chapter 5 of B'midbar describes the ritual for the woman accused by her husband of adultery. It includes this, after the kohein declares to her what will happen:
וְאָמְרָה הָאִשָּׁה, אָמֵן אָמֵן
and the woman shall say: 'Amen, Amen.' (end of 5:22)
And just in case there's any doubt, in 21 it says the kohein causes her to swear an oath.
What happens if the woman doesn't consent to saying "amen, amen" or swearing the oath? Does the ritual proceed anyway, even though the torah says she has to say these things? Is the ritual halted, and she and her angry husband go home to resolve their differences (or not)? Does everybody just wait, until someone gives up? Or what?