Are you stuck because your child is 13 and nowhere takes volunteers until 14?
I would mention this to the school as you definitely wont be the only ones struggling.
I dont understand why schools seem to have started doing D of E a year early - I've never heard of it before and then this year there seem to be loads.
If she is a daughter and is a guide, she can be a young leader at brownies or rainbows from age 13. If not she has to wait until 14. I think it is similar for scouting.