All the majors made something similar, but I think Kawasaki was ahead of the game by having a water-cooled engine.
I've had both a Kawasaki 440 Standard (Not a cruiser) and a 305 Kawi twin. I bought them both for not much $, as a matter of fact, I don't think I paid $200 together, though I bought them at separate times. Neither one was running, and both had been sitting, when I saw each, I made the owners offers to get them out of the way, and was there with a ramp and a pickup. I took them home.
I'd never pay what she did for something like that, even if it ran. Too-needy in the "safely return it to the road" category. I wouldn't have any trouble in leaving, if someone tried to interest me in a barely-operable bike, needing that-much work. She's got it now, and it sounds like she's got some free labor, I hope you get a few meals out of it, and a supply of your favorite beverage while you supply the gratis labor. I once got a Suzuki GS500F twin, basket-case for a case of beer. I parted it out, snagged some of the most saleable parts, like the regulator/rectifier, the seat, and the carbs, for later sales.
The 454 twin is a very reliable bike, easy for a new rider to use, and capable of being on the expressway without feeling like you're gonna die because you took that turn at the on-ramp. Assuming you get it running again, the way it's supposed to run, I suggest frequent oil changes, using whatever oil it calls-for, as that bike will be buzzing, though short-stroke engines are designed to turn high rev's.
Do her a favor, change the pads in the front brake after you repair the forks, and are sure they aren't leaking. Use brakleener solvent on the disc, and rough-up the surface with a piece of wet-or-dry sandpaper. The fork's probably been pouring oil onto the disc, and it's baked-into the metal. You might as-well check the rear brakes while you're at it, I assume it's a drum/shoe? Verify the condition of the brake drum, and you can de-glaze it, too, and replace the brake shoes. See how the wheel bearings are since you have the wheels off. Change the front brake fluid, completely.
Lube and adjust the throttle cable and the rear brake cable, make sure the rear light illuminates using the rear brake pedal. You may need to adjust the angle of the pedal to suit her foot position on the peg.
Putting a better bulb in the headlamp, and verifying that all the bulbs work is important to her visibility. If the turn signals are inoperable or broken, make them work, and impress on her the need to use them all the time. One of those taillight strobe modules is a good idea for making a probably slow-moving new rider more-visible to overtaking traffic.
If she already took the MSF beginning rider course, she should sign up for the experienced rider course. She will learn about motorcycle dynamics, and one of the most-important things they teach is how to effectively-use both brakes! And that would be at the same time!
Get her to keep a spreadsheet of the expenses, what's been done, and impress on her the importance of a pre-ride check for tire pressures/condition, lights function, and brakes function. If she develops good rider habits, she is more-likely to safely enjoy her ride, and being aware of good riding habits, and keeping-track of what's been done to the bike is a good sales tool if she decides she likes riding, and decides to sell for a better bike.