That is because you are misinterpreting the use of "rescue" it does not mean that was the original source of the dog. i.e when was the last time a dog in a rescue org had "akc papers" as rare a snow in july in Florida.Why are you not returning her to the rescue?
Agreed. There is no reason a rescue should ever be unspayed.Unless she is already spayed. If not, it would be best to spay prior to adoption and charge a fee for her to help cover the expense.