Although not a fan of the eRoll I believe it would be perfect for her and can think of no better setup considering the amount she smokes each day. A small and powerful battery that fires, despite its size, @ 3.7 volts.Also, I think she shouldn't be limited to one manufacture with proprietary batteries like the blaze. And semi-good battery life. She is a light smoker...maybe 3 cigs a day.
Very easily done with extra cartridges stored in a Tic Tacs container.It has to be able to fill with juice she buys. She loved being able to try different flavors and switch throughout the day.