Are you maybe saying that "soars" might mean "get better", so "failing grades soar" might mean there are actually less failing grades? That's not how I've ever understood that word.
If she told you that afterwards the failing grades had "soared", it could easily be read either way:
- The (previously failing) grades had increased, so the program must be working very well.
- The percent of grades that count as failing had increased, so the program must actually be terrible.