Do I think the lady made an honest mistake?
Yes.
Do I think she meant to do any harm?
No.
Do I think that in all innocence she could have caused a major problem?
Yes.
Do I think the customs agent was unnecessarily nasty to her?
Yes.
Do I think he was in the wrong?
No.
Even jerks can be doing the right thing while they are still being major jerks.
Whatever. I’ve been sick of people who worship the law for decades now.