I know in recent years the organisation has really clamped down on marrying outside the cult, this is the only reproach and generally would be the subject of a marking talk about loyalty.
If they are sleeping separately then they cannot be done for immorality and are following a higher standard in their courtship than many couples including some in the organisation. So the only thing they can get her for is marrying outside the org. I don't know if this is a Df'ing offence.
She needs to establish what she wants. As an adult she isn't answerable to these men and doesn't have to meet with them unless she feels it would be of some benefit.
I'm sending this BTTT in case any elders and ex elders can help with the actual rules.