Obvious questions:
Is she really getting a new ID# (verify in Customers)?
Is in this Coupon settings Max. uses per customer set to 1?
IMHO in ZenCart you cannot have two customers having the same email address.
However, I see the different ID#'s in your post...
In COWOA 2.7 a customer ordering for the second time w/o account, using the same email address, does not get a new (different) ID# and an existing Customer Referral 1st Discount Coupon has not been changed.
jpda
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