Ask her these questions and then we can figure out what to look for as far as weight, quality and price.

Does she want a single speed or gears?

Does she want hand brakes or is a coaster brake enough?

Does she want to casually putt around around for a few miles every once in a while, or does she want to put in some mileage.

Cruisers aren't much different than road bikes when it comes to enhancing the experience. The right saddle, properly adjusted, comfy bars set in a good position, and good tires that are properly inflated will all make the experience more enjoyable.