What if she put it in a locked box before shipping it to herself UPS, and she has the only key?

What if instead of UPS, she hired a moving company to move the locked box?

What if she wrote it electronically in diary.txt, but it was backed up to a cloud provider?

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I'm guessing there's some sort of "reasonable expectation of privacy" for certain activities. We're going to find out what Florida courts think about this new medium.

Saving is not sending ie passive vs active act.

Does the person have to know (or at least believe) that it will be viewed by another person?

She likely didn't think anyone would view it. Honestly, even as a career software developer I don't think it is unreasonable to think know would would see what she wrote to an AI. I assume most of what I write to an AI is not viewed by any other human, based simply on the quantity of messages sent back and forth to AIs, I would assume a vast majority are not read by another human.

What if she had written this into google docs, and she kept a diary there? That also crosses state lines, and is transmitted to another location.

You can argue from technicalities but they would need to prove intent.