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As you know a QDRO (qualified domestic relation order) is a domestic relations order that creates or recognizes the existence of an alternate payee's right to receive, or assigns to an alternate payee the right to receive, all or a portion of the benefits payable with respect to a participant under a pension plan, and that includes certain information and meets certain other requirements.
If they re-marry, the QDRO would likely be cancelled. However, any money she takes out while the QDRO is in effect is a valid transaction and she won't be held liable to repay and money or pay any penalty for legally taking out the money.