What does she currently use at home? I don't think they are necessarily complicated but there are a lot of different designs. A run down of the basic devices:
-AccuCheck Multi Clix: It has a cartridge. You put the cartridge in the device. You depress the end of it to prep the device. When it is ready the button on the side will be yellow. You then click that button. It allows you to reuse the lancets. When you are ready to change the lancet, you twist the end. There are lines on it that show you how many you have left in the cartridge.
-AccuCheck Soft Clix: This uses one lancet at a time. You have to put it in and take it out each time you change. It's main advantage is that there is only one "button" to push. You depress the end to prep the device, then depress it again to do the test. It will not work with standard sized lancets and I have found that the lancets are harder to remove and you must be careful not to stick yourself. However, if you are preloading the lancets for her, it may not be too bad.
-Microlet, Autolet, etc: These typically come with the meters and are very small. You **** the device using a button on the side or the end, and then press another button to test. They take standard sized lancets which gives you a good selection when you shop and you can try different manufacturer's and gauges to see which ones work best for you.
-Renew: This is much larger and a different shape than your typical lancing devices. Like the MultiClix, you load in a cartridge. Unlike the MultiClix, you may not reuse lancets. You use a handle to **** the device and then press a large button in the center to test. It is about as painless as they get and might be easier for her to use. It will not fit easily in a standard meter case however.
-Pelican Sun: This is a much more expensive lancing device. It is an electronic device that uses a 50 lancet disk. I have not used this one to be able to comment on it.
