PARIS — By all logic, Chanel should be floundering. A global juggernaut without a captain, the house has been in limbo since the abrupt departure of Virginie Viard, drifting toward an uncertain horizon while awaiting the arrival of Matthieu Blazy in the fall.

Elvis Presley’s granddaughter and “Daisy Jones & The Six” star Riley Keough, who famously swung on a swing in a giant bird cage at a recent Chanel show, jumped up from her front row seat to share her excitement about being a brand ambassador. “It’s amazing. I feel so lucky to be involved with the House,” she said.