Her goose was cooked at this point: "One of the managers asked Ms Sy whether the posts were hers, and she confirmed they were."
In the immortal words of Roger Stone: “Admit nothing. Deny everything. Act surprised. Look concerned. Make counter-accusations”
Oh, I know they would have got to her in the end, but at least make them fight for it.
Never, ever talk to the cops (even if you are innocent), and never mistake the Chief Pilot's friendliness for sympathy or that you might get a fair hearing.