Refusal to honor credits

My daughter was to begin classes today at the South Beloit, Illinois High School, but they will not honor her home schooling credits from last year.

Are there laws to protect her, so that she does not have to repeat her sophomore class? She completed all her courses with me and I am satisfied that she is more than capable to advance to her junior year. Could you please give me advice as to what to do next? Thank you!

Sincerely,
Debra J. M.