Safiyya Amira Shaikh, 36, from Hayes, Middlesex, admitted preparation of terrorist acts and dissemination of terrorist publications at a listening to on the Outdated Bailey.
The cost states that Shaikh made contact with somebody who might put together explosives and went on a reconnaissance journey to scope out the historic web site and a resort as places to plant bombs.
She ready the phrases of a pledge of allegiance to the group, also referred to as Isis or Daesh, between August 2019 and October 2019.
She additionally shared terrorist paperwork through teams utilizing the Telegram messaging app over the identical interval.
The defendant, who wore black gown, spoke quietly as she entered her responsible pleas earlier than Mr Justice Sweeney on the Outdated Bailey on Friday.
Mr Justice Sweeney ordered pre-sentence studies forward of sentencing on Could 12.
The choose ordered that the defence ought to serve any psychiatric report by April 3.