If her workouts are tough enough to “earn” them and put them to work, workout nutrition is always the first logical step. For example, <a href="http://www.t-nation.com/store/products/plazma"target=“new”>Plazma (1 serving pre and during would be enough for her).
<a href="http://www.t-nation.com/store/products/mag-10"target=“new”>Mag-10 would be a good choice too.
Also look into <a href="http://www.t-nation.com/store/products/carbolin-19"target=“new”>Carbolin 19 (a favorite of my wife’s) or <a href="http://www.t-nation.com/store/products/seven"target=“new”>Se7en. Neither contain caffeine.
Just as an aside, we’d suggest conditioning over long duration running, and she’d probably enjoy more: http://www.t-nation.com/training/predator-conditioning