Looks like a great letter in response to a difficult situation. I thought about your last post, but looks like I didn't reply. Mostly I was thinking how hard it is to meet one's own social standards in response to someone who is playing by different rules. Somehow we consider it rude to enforce boundaries against rude behavior.
If it were me, I would restrict the allowed contact even more: "I plan to ship the artwork to [address] via [mode] on [date (a week or so away)]. Please respond by [date - 1] only if [address] is invalid."
Unless you'd rather keep the artwork, in which case I wouldn't offer. In my humble opinion, the decision is yours, not hers.
Then after [date] I would send the thing off (or not) and block all known addresses, phone numbers, etc.
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If it were me, I would restrict the allowed contact even more: "I plan to ship the artwork to [address] via [mode] on [date (a week or so away)]. Please respond by [date - 1] only if [address] is invalid."
Unless you'd rather keep the artwork, in which case I wouldn't offer. In my humble opinion, the decision is yours, not hers.
Then after [date] I would send the thing off (or not) and block all known addresses, phone numbers, etc.
Good luck with a hard situation!