How to increase velocity as a pitcher

My daughter just made her jv team as a freshman. She was basically told you made the team because you throw strikes and the coaches feel they can develop her. Doesn’t sound like she’ll play much of anything else at the moment. My daughter is small, 5’0. I know she doesn’t throw that hard. She has a decent enough change up and is working on a rise ball. Anyone have any sources for how to increase velocity? Develop a pitcher overall? Thanks