@Katlyn you need to be firm and stick with zero diapers policy.
Maybe your daughter needs a psychologist? Why does she insist on wearing diapers. Is there some trauma in the past? Or is she just lazy.
So, your daughter is wearing diapers to primary school now?
Won't she be embarrassed by it? Won't her classmates laugh at her?
Who changes her diapers in school?
Will school even accept her or need to go to special education schools?
Personally, I think you just shouldn't allow her to wear diapers anymore. It is going to ruin her future.