Well she's been in it long enough to know if she wants it that way or not, and I don't think any of us have the right to tell her she should turn down opportunities that are given her. Besides, we don't even know if working less is the main reason.
Another possibility I don't think has been mentioned is that this could be a way to go condom-only without making a big hoohah about it. Would that be an acceptable reason to you, while you're deciding what it's ok for her to think?