Beswitched - Kate Saunders

When Flora Fox's parents send their daughter off to boarding school,
they have no idea that the train will take her back to 1935.
On the journey Flora has a strange dream. She wakes up without
her laptop or her phone, wearing a hideous uniform with ridiculous
bloomers underneath. She is a new girl at St Winifred's, where
the rules are mad, the food horrible, and the hairiness of the teachers
unbelievable. Her 21st century manners will not be tolerated
at strict St Win's - how will she ever survive and find her
way back to her own time? But there is a special reason why Flora
has been summoned to the past. It involves the tempestuous girl
who becomes her best friend... BESWITCHED is a wonderfully funny,
classic story from a popular and very talented children's author.