I've now found Mimi Rogers Strava account. There is a Strava activity widget on the homepage of her MimiRunsUSA webpage but it's otherwise cannot be found from Google for some reason. The Strava data has cadence and shows she did about 61.4 miles for the first day of the transcon (Sept 7).
And most of the photos, videos, and discussion is being posted to Mimi's personal Facebook account instead of her Marvelous Mimi account she typically used.
https://www.strava.com/activities/morning-run-1173093219