OK, so you’re happy with a 10 mile+ route? There’s a few options, but a good, moderate route around there would be something like this:
https://www.plotaroute.com/route/678293
21 miles, 2200ft (nearly flat, really!) and rideable all year round. Done this one more times than I can count.
For a shorter ride for her, it’s not quite Bolton Abbey, but this is a nice ride from Gargrave, just down the road:
https://www.plotaroute.com/route/476842
11 miles, < 1000ft. Again, more or less firm going and another all-year-round route.
(Make sure you visit Abbot’s Harbour at East Marton!)