That was after Jingyan had told his mom that he was entering the fight for the throne, yes? I don't think his mother and Gao have any official contact, but it's possible she sent notice, or a hint, through one of the eunuchs (iirc she does seem friendly with one or two) that she'd appreciate a chance to see the Emperor again and if Gao could perhaps do something.
New headcanon: Gao really admired Consort Chen.