Without a doubt I would put the emphasis on reps. She needs to improve on control and refine her change up as well as add a spin pitch, and you can't get any of that done with just physical training. If you want to work on adding velocity include some weighted ball practice. I don't know what her practices include now but a section of it should focus just on just throwing fast, and finding that edge where her mechanics break down or where she 'over throws'. If you have the time to work on these things and do some PT then have at it.What would you put more emphasis on between the two topics posted above and why