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Your hypothetical makes zero sense as your questions have simple yes/no answers.

> Even if it's consensual, what happens when she decides she wants to move on from the relationship?

Then they're no longer in a relationship and still have to follow HR/company policies.

>What about her peers that didn't receive promotions while she did?

Did they follow the company policy (e.g., hiring committee recusal) or not for the promotions?

>This is why these laws exist.

Did the company policies follow employment regulations when setting and enforcing their policy?

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The implication here is that they didn't follow company policy or else this wouldn't be an issue. HR would have said, "Yes we're aware of the relationship, all of our policies have been properly followed in relation to it." The fact that we're not hearing that means the answers to all these questions don't have pretty answers.
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Well, I guess they should fire her, then.
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