Rather different, but we did have the experience of the school suddenly saying, at the last minute, they would no longer offer the subjects that my child wanted to do at 6th Form. Uniform was irrelevant and the bus was dedicated, so they weren't issues.
However, they did have the similar experience of having to make a difficult decision with only a few days to research options.
As sometimes happens, it was a blessing in disguise. A nearby FE College was offering the International Baccalaureate: www.ibo.org/. They did that, able to do their preferred subjects + broader curriculum. It played to their strengths, and they have done brilliantly ever since.
I hope something similar happens with your DGD. And I also hope you can get refunds.