The Washington Times provides one answer:
The head of the 2.3-million-member denomination first made her wishes known last week in a request leaked to the New York Times. When that did not produce a response, Bishop Jefferts Schori sent Archbishop Akinola an official letter Monday.Is the Washington Times implying a request was sent to Akinola? And why the PB's original statement being characterized as a leak? It wasn't a leak. The NYT asked for her views and she provided them with a statement.
What was made public was her letter to Akinola of April 30. That letter requesting that he not come to the US for the installation of the unelected Martyn Minns.
LATER. May 3 in The Washington Times:
Earlier this week, Presiding Bishop Katharine Jefferts Schori sent Archbishop Akinola a request by e-mail and airmail that he not officiate at the gathering.
Canon Akin Tunde Popoola, a spokesman for the archbishop, e-mailed The Washington Times yesterday morning to say they had received neither request.
"It will however be strange that [the Episcopal Church], which had all along explained why the election, consecration and enthronement of Gene is irreversible," he wrote, "suddenly feels that of Martyn Minns, elected by the Nigerian House of Bishops, can be tampered with."