The bus was bought with money from Charlotte’s estate by her parents Amanda and Dennis in 2017.
It had been used by the school for regular trips and to take donations to a local foodbank.
Last summer, the school used it to take a group of children to the north-east of England after they qualified for the final of a football tournament.
“That was one of the things she wanted the children to be able to have: fun experiences in terms of their learning outside of the school environment,” head teacher Mandy Harris said.
Ms Harris said the school is now having to pay for coaches to take children swimming and relying on parents to give lifts for school trips.
A number of planned excursions have had to be postponed.
