I don't see how 200K miles can get you two open-jaw tickets, east in Business and back in Comfort+. Business one-way USA-Europe is going to be 75K (partner) or 86K (Delta) minimally per ticket if I'm remembering LBJ's posts correctly.

You surely don't want to book these as separate award tickets USA-Europe and Europe-USA: you'll get tagged with the international origin surcharge. An award ticket really should be open jaw, CLE-PRG, VIE-CLE.

If you're trying to maintain Silver I'll suggest booking a paid ticket for yourself and the open jaw award for your daughter.

There are paid award-finder services: Award booking services - a list and some reviews I don't have experience with any. Perhaps they can offer a paid and award combo service. That, or you need a saintly Delta phone rep. I did a paid 5-person, 3-origin-city booking through a rep years ago. He earned his pay that day!

In September I see Premium Economy tickets one-way DUS-CLE on SAS for Euro 1,333. One routing is DUS-CPH-ORD-CLE.