Nobel rules bar transfer of the prize, but laureates may give away the medal and the money

A Nobel Laureate Cannot Officially Transfer the Medal or the Status of Laureate to Another Person.

Precisely so: under the official rules of the Nobel Prize and the practice of the Nobel Foundation, a laureate has no right to transfer his or her Nobel medal, or the Prize itself, to another person.

The statutes of the Nobel Foundation contain no mechanism by which an award might be re-registered in another's name.

The decision to award the Prize is final and not subject to appeal, and the status of laureate is attached for ever to a specific person or organisation. The Norwegian Nobel Committee and the Nobel Institute have stated officially that the Nobel Prize cannot be revoked, transferred or reassigned once it has been presented.

Yes, a laureate is free to dispose of the monetary portion of the Prize as he or she sees fit, for example by donating it to charity, since once received these funds are regarded as the recipient's personal property. So if Machado were to hand Trump her money as well, no objection could be raised to that.

Transferring the medal is possible if the laureate wishes to deposit it in a museum or give it to someone as a gift, but this alters neither the legal nor the official status of the laureate and does not constitute a transfer of the Prize itself.