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Since you already have a “Cloud Ready” printer, there isn’t too much more you will have to do. She is going to need two things for her iPhone and iPad - the Chrome browser and the PrintCentral Pro app (there are two versions on iTunes, one for iPhone and one for iPad, so make sure she gets both). Chrome is free, but she is going to have to pay about $5 for PrintCentral Pro. Once she has those installed and she is connected to your network, it should be pretty straightforward.
If you need more info, you might want to look at Google’s Cloud Print beta website.