Don't worry, I am calling. (I keep hoping I will get a helpful agent who will attempt to make something happen)
I am going to have her ask at the DL counter when she checks in also, but...
This is a business class milage ticket. I have checked the fare classes, but so far none of them show the "free" ticket class available. (There are LOTS of seats at all other fare classes however. I am not sure that DL shows on the ITN and other sites the FF seats anyway. Since unless DL has a lot of upgrades waiting on all the flights they will be flying this route with empty seats while I would assume they have to compensate CO for the ticket she is using. Doesn't make any sense to me.)

I don't know if there is a SkyChoice for International. This one cost me 90,000 miles so that seems to be plenty.

I figure it might cost me a re-routing fee, but.... it would save her several hours so it would be worth the $50 or $100. (I have no idea what the fee is now!) Right now I arrive in Paris on AF about 4 hours before she does and get to hang around waiting on her. We are renting an apt and it was just easier to try and find this together!

I will let you know if I am successful!