>>9163977I'm a big fan of the Snapfire. Much cooler design than the Jolt, I really dig the hollow skeletal grip and it's satisfyingly twirl-able. Hits around 55 FPS. I find it pretty easy to prime, but then again, I am not a kid, so I'm not sure if it's doable for your daughter.
...speaking of which, the Jolt itself is probably a good choice as well.