The Guia Roji is great. The New National Geographic map just came out and it comes highly recommended too (much better than previous versions). Map info here.
If time is running short, you'll find Mexico maps in the southern US gas stations as well as the OXXO stores (similar to a 7-11, they are all over Mexico).
Check with Sprint about the phone. Most major carriers will work but you'll pay through the nose on roaming charges. Another option is to purchase a phone in Mexico for cheap. No "2-year" plan required. You'll see them sold in lots of places. Maybe $20 for the phone and then buy $20 worth of minutes. Don't sweat it too much, if something happens on the road, you'll meet lots of friendly locals who will offer to help. Internet (and skype) are everywhere too.
Hope she has a great ride!!!
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