It's not really that big a deal. And since she's the one that needs it, why not have her take care of it?

Renting would be the easiest and least work at the highest cost. Getting a simcard and an unlocked phone to handle email isn't a big deal either. www.mrsimcard.com and buy an unlocked phone on amazon. I use a Lumia 520 and it works.

If she has AT&T, when on the west side (norman, soper's JVD) you can often get a decent AT&T signal.