How tall and heavy is she? I assume you are looking only at high-back boosters?
The Turbobooster fits most kids, especially smaller kids, really well. They run about $45. Very lightweight! You want to make sure that the booster helps the belt fit properly on your daughter (not all do!). The lap portion should be low across her hips, not across her soft abdomen.
Also consider if you are going to want a "LATCH-able" booster or not. Some boosters have LATCH connectors (like a car seat). These do not make the booster safer for the rider. However, when an un-LATCHed booster is unoccupied, it must still be buckled in with a seatbelt so that it doesn't become a projectile in a crash that could injure other passengers. Are you willing to buckle the seatbelt over the booster every time? If not, you may want to look into a booster that has the option of using LATCH. The Britax Parkway SGL is one option. It fits taller, leaner kids well. The Sunshine Kids/Diono Monterey is another option which would be good for a stockier, broader-shouldered kid. They aren't as cheap as a Turbo, though.