Have her read some of the articles on this site. A favorite beginner book by some is Robert Fenner's "The Conscientious Marine Aquarist" - or something like that. Pretty good still, except for the cycling with fish refernce in it. Use this sites guide to cycling instead.
She's gonna need to know if she's doing reef or fish only too since that'll dictate lighting and maybe other things you'll be buying - and spending options.
Live rock is a must IMO
tanks. More for reef tanks. 1 - 1.5 lbs of live rock (LR
) per gallon of water is recommended for reef. Less for fish only.
I like the idea of two tanks. One can be a quarantine tank for new purchases. I'm a firm believer in that process. The Qt tank is a lot cheaper, since usually no rock, sand, and cheap lighting will do. Good luck and keep us posted before committing to any purchases and such. We'll help.
And of course, Welcome to AA!!!