She absolutely did. She and Charles decided it between them. He won't be opening any of the boring things Royals normally open, and won't be making at the usual balcony appearances on Royal Jubilees and weddings, nor will he be doing meet and greets at ambassadorial dinners etc. He no longer has a Royal role and no longer represents the RF.She didn't banish him from public life. Who the hell would want him opening their local village hall? He had to retire. I agree there is nothing b she can do really. But the Palace has done everything it can to protect him until it was impossible. The nonsense about the picture being doctored was from them.
Until he's actually convicted of something that's about all she can do.