Small in stature with a big heart and great attitude. If this is your daughter, any coach should be happy to have her pitch for them! I know I would. Maybe she's max'd out and maybe not. Time will tell. One thing is for sure, a kid with a good attitude is always going to be trying and will give it her all every pitch.
What pitches she can work on that can be effective is the curve, drop, and screw. The spin pitches don't care what size you are. If she can spin them and hone a command of them the pitch will prove itself valuable in her arsenal. Deceptive pitches like the change up can of course be a weapon. Shoot for about 35% speed difference and as she masters it, try working on locating it on the corners. Even a "too slow" change up can have its moments if well placed. A good instructor will want to teach all the pitches to her regardless if she can master them. The knowledge alone can be positive. Few girls master all the pitches. Few girls accurately throw all of them well every game. they warm up and pick the top 3-4 that are working that day and let those pitches define her in that game. The next day may be different. Learn them all, then decide what works.
Odds are she'll never have the hand size for it but there is one pitch that is a lost art------------the knuckle ball. In my short time coaching I have only seen one girl ever throw it with enough control and frequency that it was effective. Some instructors will teach a palm ball to be used as a change up but few girls can throw it with accuracy. Normally it takes a large hand and long fingers to attempt a softball to knuckle. Here's a pitch that will effectively make the pass from circle to home in the low 40's in speed and leave a girl shaking her head after seeing one.
Look gang, we've all seen that average girl win big games just as we have seen the best get rocked at times. It's not the normal but does happen. The original post is from a content parent that has been forthright in asking the questions presented to us. As usual, a dominating debate over speed erupts. Let's be encouraging to these people that will probably be an asset to a program somewhere if nothing else because she has heart. 5 foot tall and bullet proof can have a wonderful career in this game. they simply need to find their spot in the big picture. Good luck.