well, I got here starter kit witch comes with the 11 mg prefilled carts. I am getting her a few different bottles so she can try different flavors. I was trying to decided whether to order her some mega carts or a drip tip for her real usage though. So I shouldn't bother with the 10ml bottle from the sounds of it.
10ml is a start and it'll probably last her for a week. I wouldn't bother with mega carts yet. Drip tips can be had for about $2 or $3 so why not toss one in. What you might want to add is some pre-filled 510 cartomizers. Cartomizers are the second most (very close second btw) preferred method so it would be a shame if you couldn't let her try them. They can be refilled pretty easily - don't just toss them when they're empty - and they are about $8 for a 5pack.