Hiring a guide service to bring in the gear might be the best way to go. The issue isn't sleeping outside as much as the weight of the gear and the cardiovascular stamina to do climbs. Mom isn't as spry as she used to be!
The challenge is to find an area that has a lot of scenery per mile that doesn't require a huge elevation gains. Part of this can be achieved through low-mileage days, I suppose, but honestly, I am interested in finding a hike that has only moderate gains and drops. You hike a ton in California - and mom lives down in the Bay Area, do you have any suggestions as to good places to target?
She's hiked the Lost Coast, for example. But finding something in the mountains would be great that don't involve huge gains. I am almost thinking that sections of Tahoe Rim trail might work, especially if we can hike in from a pass.
But certainly, there are other areas south of there that are really quite a amazing but of course, involve substantial climbs.