Let her know that she can't get around the rules by appealing to one parent over another. (empoweringparents.com)
Unfortunately, there is no way around this rule so you will have to at least book a main cabin fare in order to be eligible for an upgrade. (rewardexpert.com)
There are many cases where the courts have worked around the rule by finding such as two contracts rather than one. (disinherited.com)