There are some good suggestions above. I think the important thing is to somehow continue German and note on her applications - stuff like this happens a lot. Our district still offers German but dropped Italian a few years ago.

While she is signing up for the German Subject Test, remember to sign up for Math Level 2 and a science Subject Test - MIT requires two Subject Tests - Math 1 or 2 plus a science, and Harvey Mudd requires two, one of which must be Math Level 2. Best to sit for the tests by December (at latest) so the scores will be there with her application.