it's quite difficult for nonrev travel even on Delta to our African destinations. there are frequent embargoes on flights. Is she the employee? If you're the companion, you can take your chances but the fees are $$ plus visas in some cases--on top of the mileage. If she's going for work on your companion pass, that's a no-no. You can lose pass priv and/or be terminated.
Congrats on the pending marriage and good luck!!