Your daughter's curly hair is the result of a recessive 'curly hair' gene that she inherited from you and your husband...
For an organism to acquire a recessive trait from two parents with a dominant trait, the parents must both have the recessive allele for the trait.
So in the punnett square below, if both you and your husband have a recessive allele, but are carriers, your daughter has a 25% chance of having 2 recessive alleles, which in this case curly hair, in turn showing the trait
pardon my handwriting