@Muffinman 

this resource is a little nerdy, but it has a lot of good info for a beginning cyclist:

https://www.sheldonbrown.com/gears.html

Try to encourage your fiance to just play around with the shifting and different gear ratios on an easy ride. Help her learn how the system works and how different positions make pedaling easier or harder. If she doesn't want to do it, that's her choice...but eventually she'll see the light. 

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