Get mom her own copy if the navigator each night. Bring her a highlighter in her favorite color and you and the kids can mark yours and plan for the next day and she can make her own plan. Point out things you think she might enjoy and when they fall during a time you aren't booked, consider joining her. I like kcashner's post it suggestion too.
Disney Wonder Mexican Riviera March 2011
Oasis of the Seas Eastern Caribbean May 2013
Sapphire Princess California Coastal January 2014