i dunno it seems like a good carbine for my 10 year old daughter to shoot in 9mm. 9mm is cheaper them most ammo (except 22), and I think it would be a good starter carbine/rifle for her. Not to mention its not a bad looking 9mm rifle for the price
For your daughter, it might be a way to foster her interest in shooting and have something that doesn't quite look like your typical firearm. My question is how much recoil she's going to want to have or deal with at ten years old. I know it's just a 9mm, but to a child who doesn't have a lot of weight to absorb the recoil it could get uncomfortable. -I'm not a huge fan of Rugers, but I must admit that a 10/22 is a good entry level rifle for a young shooter and .22LR is relatively inexpensive.
My issues with the CX4 are related to the limitations of the platform and its usefulness outside an indoor range. To me and many people I know, it really felt like a handgun with a stock. As a plinker, it should be fine. However, before you buy one for your daughter I strongly recommend you have her try one at a range first.
This advice has nothing to do with the CX4 itself. It's just that when you buy a firearm for someone else, you have to deal with that person's likes and dislikes. Something that may annoy me or you may not even be noticed by your daughter whereas something that bothers your daughter may not be an issue for us. -I've watched many guys buy guns for their wives, girlfriends, and kids without consulting the intended recipient. Often, they had to take a loss when they turned around and sold the gun because the gun wasn't right for that person.