Are you going to ship Britney back from SA to Europe? Costs for shipping are probably more than she is worth, so you must be doing it for other reasons.
As Brian said, check out Lan Cargo (the cargo division of Lan Chile, the national airline) in Santiago. You can get your wheels back to Madrid or Frankfurt for pretty cheap.
Take a look at my shipping report in the shipping database as I have left pretty detailed instructions of the costs, and who contact, what to ask for, etc.
Pricewise Lan Chile can't be beat right now. Especially since Britney is so lightweight.
Glad to see you are still enjoying your trip. I'm doing prep work and planning my next trip, as I sell my soul to the corporate devil for a while.