I think Subtomic's advice is pretty solid. Personally, I'd point her in the direction of the acoustics, BUT, if she really just wants to rock out electric style, that's her decision. Surfguy, as far as your question, I'd get something custom made. Maybe something like this: Or these: And that's just for starters!
Surf, I hate locking/floating trems. I have one on a Kramer pacer (Floyd Rose - a good one, not a copy) and, while it does stay in tune, it's a pain to string up and get in tune initially (you have to keep adjusting the tuning and the spring balance so the float is perfect). Not to mention that if you bend a note, all the others go out of tune unless you rest your palm against the bridge. This is a big deal if you try to do any bends while hitting other notes simultaineously (like the musical interlude on Bastille Day before the guitar solo). I have a Fender Strat with it's standard non-locking trem and it's, IMO, great. I have it set flush against the body so it only goes down and only use it for vibrato on chords or harmonics (very occasionally vibrato on notes). I never dive-bomb and it never goes out of tune. I used that Kramer for years and really liked it but when I got a new guitar one of my goals was to get one with a non-locking/floating trem. IMO, if you go crazy with a trem, then the locking kind can be nice but if you just use the trem for vibrato on chords, etc... a regular one set up properly should do just fine. Some of the newer/more expensive guitars come with locking tuners which replace that locking nut and that concept sounds a whole lot better to me. As for a beginner, I would suggest a hard-tail and avoid all the issues with a trem in the first place. It will make tuning and re-stringing the guitar a whole lot easier.
If I could only spend a couple hundred bucks, I would buy a Baby Taylor. Most come wit a nice travel case.
Have to agree with Chase.. The standard tremelo when set flush to the body eliminates most tuninmg problems associated with them. Of course it also illiminates the ability to bend the pitch upwards, but it's a small sacrifice to have that bouncy string action a tremelo provides, not to mention a whammy used with discretion is very cool.
