Altsmoke, Discount Vapors, and My Vapor Store are good all-around online vendors to purchase hardware from.
I'd recommend getting either a eGo Spinner or eGo Twist for variable voltage capability. This would allow her to change the heat of the vaporizer to different flavors used. The below video demonstrates how this function is done. You'd also need the appropriate eGo charger; a usb/wall charger is handy for allowing charging the battery when not near a computer port.
Clearomizers are a good choice in
juice delivery
device (the topper that goes on the battery) for a beginner, being easy to fill. Be aware that they typically only last 2 - 4 weeks and then need to be replaced, unless you get the rebuildable ones that can use replacement heads. If you end up getting a variable voltage battery like a Spinner or Twist, get them in the 2.8 ohm variety. If a single voltage eGo battery, 1.8 ohm will do fine.
How to use and fill a clearomizer:
How to Fill a Vision eGo Clearomizer (aka CE4+ or Stardust Clearomizer) - YouTube