Schools work with transferring students all the time. Military families, kids switching from one parent to another. My kids transferred on March 1 of their sophomore year, and basically lost a month of school since the school they left had just finished the 2nd semester and the new school was most of the way through the 3rd quarter. They worked hard to catch up but it did show in their grades. I should have been more involved and asked for more time for make up work, but I was starting a job and getting settled in a new home. We all survived. If a military family transferred from Japan in March, the school would have to allow them to transfer in and finish the year. They make adjustments for classes they don’t offer, may have them take a gym class or art class where they can just pick up where the rest of the class is.
Your daughter might be able to take some classes in the summer when she comes back, either online or at a community college, to make up the credits. I don’t see why the school wouldn’t accept homeschool credits It seems like she could get the courses done in Jan/Feb before she goes, finishing her sophomore (?) year.
I suggest you do what you can and then just have her enjoy the experience.