Hi Scotti
Just bought a Kia Sorento with electric power steering. It steers great and doesn't load the engine down. My wife has a 2011 Hyundai Santa Fe with hydraulic power steering. Recently a hose burst and the fluid leaked out, wrecked the power steering pump and steering rack. I fixed the car with parts from a junk yard but it was still expensive and messy. Hyundai uses a special expensive fluid. Luckily there are a lot of old Hyundai's in junk yards. Is there a generic fluid that works in Hyundai's? Can the Hyundai be converted to electric power steering. Seems the elimination of fluids and pumps and hoses that burst would be a god send. Or should I just buy her a new Toyota?
Did some research. EPS steering is applied to the shaft between the steering wheel and the rack. In hydraulic steering the assist is applied to the rack itself where by the fluid pushes either side of the piston that is coupled to the tie rods. The gear in the rack would wear out if it was constantly subjected to the full pressure of steering without the hydraulic assist. The kits for this purpose or even a junkyard EPS rack is rather bulky and there is not enough room the fit the extra stuff needed. Then there is the electronics. Their is an ECU which on the after market kits would be fine but a used one from a car wants info from the CAN buss. Without that info it won't work properly.
I assume the new rack just installed will last until I junk the car.
Just don't tell my wife. 
Converting a car from hydraulic to electric power steering? Maybe if you need a hobby to keep you out of the house for a month or two of your spare time. Save your time, money and energy for fixing other things that will eventually go wrong on a 10-year-old Hyundai.
Just buy her a new Toyota.
The youtube channel The Car Wizard put electric power steering in a 1968 Mustang for one of his more frequent customers. He used parts out of a Prius I think to adapt it. However the car in question had a manual (no assist) system in it already. I don't think such a thing exists for your Hyundai.
A Hyundai is a use it up and throw it away car. It's not likely you'll have to fix this again, drive it until it breaks and replace it. Less hassle.
'Or should I just buy her a new Toyota?'
Why not? Electric power steering is computer-controlled.
power steering fluid is just hydraulic oil. Some cars even use ATF in the power steering.
Listen. I am not a mechanic. I know just enough to be dangerous. In 1994 I bought a brand new 1500 Chevy Suburban. One of the problems they have is if they don't start they are to heavy to push. One day it did not start. The only thing I had was a Chiltons which covered Chevy 1500 pickups and suburbans. It told me where to look and I discovered the fuel pump was no good. The pickups have a access door in the bed to service the pump which is in the fuel tank. What does the suburban have over the gas tank? Sheet metal and carpeting. Chiltons said you would have to drop the tank. I just filled it up and it had 40 gallons of gas in it. Thats 120 pounds worth of gas! Stuck in my driveway I pulled up the carpet and cut an access hole in the floor to get at the fuel pump. Got a new pump at a auto parts store and got it going. Covered the hole with some sheet metal and put the carpet back in place. Drove it until 2011. So it's not inconceivable to change the hydraulic rack to electric if there was one that fits.
knock yourself out. But steering is a bit more involved than a fuel pump.
I would advise against converting from hydraulic to electric power steering or EPS, because there is more involved than just the hardware. It’s fairly high tech. In a nutshell in an EPS system data from the torque sensor, the steering angle sensor, and the vehicle speed sensor is fed to the ECU which then determines how much assist to give via the electric motor tied to the rack or column. The amount of steering assist will be different at low speeds (think parking) than higher speeds (think highway). Essentially, you will have to reprogram and find tune the whole system (via embedded software) to work the way you want. To me, that is way more trouble than it is worth.
It might be a nice project while we are locked down. No body bothers me while working in my driveway without a mask.
Good luck then and share your progress if you want.