You shipped using the GSP and the parcel ended up appropriately in the GSP plant in Erlanger.
You can ever see it on Google Maps.
The GSP will ship it to Canada and probably it will be handed over to Canada Post.
Is there a way to catch it in transit and have the number added?
No.
Your customer's best bet is to keep an eye on the tracking (there will be a UP.xxxxxxx number once it gets to the plant, the USPS leg has a different number.)
Once it clears the border,usually only a couple of days at most, she should put a postit note on her apartment mail box telling the carrier she is expecting the parcel, but not to Safe Drop it, but to take it to the PO for pickup.
Most letter carriers can read.
The smaller her apartment building, the more likely this is to be successful.
As the seller, your responsibility ended when the shipment got to Erlanger. So you are helping her because you are a polite and helpful person.
If it cannot be delivered, it will eventually get back to.... hmm. Good question.
Normally an undeliverable shipment would wend its way back to the seller. With GSP, her error (and it is her error, not yours) may mean that it goes back to the GSP who will deal with it as they see fit, whether that is donate or destroy.
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