Well you don't necessarily need a charging station, but buying rechargeable batteries may not be a bad idea depending on how many games you play and how often.
Best Buy, Futureshop, Gamestop , Walmart, Zellers, any store that sells video games is fine. New and used doesn't really matter, you get used games cheaper and they play just the same.
Anyways take a look in this thread for game suggestions, not all games may be for her but games based off movies etc. are good titles. Also going to a store, look for games with an E rating, those are titles she will be able to play and enjoy:
http://www.wiichat.com/nintendo-wii-...-buy-rent.html