She did not send it but brought it herself. So why would that inflict on any
secret UA ruling?
Harvesting the envy of the other pax doesn't make it wrong .
They are going to survive it, I suppose.

On an IAD-ZRH run a pax in C kept ordering booze and then fed it to his GF
(or whatever the relationship might have been) in Y. Now that is circumventing
a sales channel of UA and a direct violation of the rules as who's entitled to
serve alcohol. But there is not such things for ice cream.
Yet.