You must be coach Jeŕry. The usual complaint is that American pros don't run enough in Europe against the best. We finally have one who does and you want her to stay at home and work on tactics. Goule, Reekie, Hodgkinson are all examples of runners who improve while running dl meets, no reason Sage can't as well.
If we're honest her whole season came down to one race, the usatf final. Had she advanced like Rogers, all would be fine. She didn't and there wasn't a late season pr to rescue anything.
She'll be back next year at either 800 or 1500 and will again be in the mix to make a us team. It won't be any easier and she'll need to bring her best performance in the 1 race that counts.