|At this point you have to decide who is going to do the heavy lifting. For all intents and purposes, printing is nearly a commodity service. Sure, some are better than others, but unless you're really trying to make art prints, you're splitting hairs.
Your best bet is to upload them to the online photo service of the closest drugstore near her and let her order them, pay for them, and then pick them up. And tell her that if she wants something big, to let you know which one and you'll handle it. And then you can use WHCC ;-)