The 2015 St Leger winner has not been seen since trailing home last in the Ascot Gold Cup at the Royal meeting in June after she met with a setback in the build up to last month's Goodwood Cup.
Plans are now in place to send the five-year-old daughter of Duke Of Marmalade straight to the two-mile Group Two contest on October 21, in which she finished third 12 months ago.
Beckett said: "Simple Verse won't appear until the race on Champions Day she is entered in.
"She has just taken a while to get over the muscular issue she picked up in the run-up to the Goodwood Cup.
"There is really little point trying to rush her. She won't be ready for the Cadran as that is only a few weeks before.
"It is a shame, but we have got just under six weeks to get her ready for Ascot."