My DD will be a first year 14U this year, but an older one (she turns 14 in Feb). She isn't a great pitcher yet, although I think she may have some potential, but it still hasn't clicked for her yet (mentally, as in, wanting to put in the work required). Sad as this is, if it doesn't click soon, it may be too late in today's fastpitch world
As relates to speed, she played 12U last year in Virginia/Tennessee. For other pitchers that I saw, comparing them to her pitching, I would say that I saw speeds from the low 40's (not very common) up to the mid 50's (also not very common). Most were probably high 40's to low 50's. Usually, the faster ones seemed to have only a fastball (or whatever pitch that looked like their fastball) and decent to poor changeups. Interestingly enough, even the poorer changeups worked quite often.
My DD pitches fairly consistently in the high 40's to 50. One game she got mad, pitched without thinking about it, and was probably close to 55, so I know it's in there somewhere, if she can just find it all the time. Her control is improving, but she still has a ways to go.
As to pitches, I agree that some teachers show them different pitches to keep them interested. My DD's coach does this, both for that reason, and to see which pitches she seems comfortable with. He has shown her different grips and releases for several pitches, like drop ball, curve, changeup, etc. But, in practice, we usually work on FB, drop, 2 (actually, he's been showing her a third recently) changeups, curve and to a lesser extent, screw. In the last month or so, he's started on the rise ball a little.
In games last summer, I usually only called FB, drop, curve, and whichever of the 2 changeups seemed to be working better that day.
Her drop ball drops a little, but not a ton. Her curve ball breaks a little, but not a ton. Her 2 changeups are probably her best pitches, she disguises them well, and they are different speeds (one about 10 mph slower, one closer to 15 mph slower) and give the batter a little different look. Her screw ball works occasionally, but is too slow. Who knows where the rise ball is going

(not to mention whether it actually "rises" or not, although occasionally it does seem to level out more than her fastball).
So, I don't claim that my DD can pitch 55+ (even though she may have at least came close to 55 a couple times last year) or that she can throw umpteen pitches, even though she has probably been shown how to pitch that many different ones. She pitches in the high 40s and has maybe 4 pitches that I feel comfortable calling in most situations.
I'm just trying to get her to work on her strength this winter (legs, core, and arms), and I found a place where we can pitch a few times a week inside, about 50-75 pitches each time, in addition to her weekly lessons. If she can get closer to 55 by spring, improve her control, and at least improve her drop, changeup(s), and maybe curve, I will be extremely happy. A rise ball that I would feel comfortable calling a few times a game would just be icing on the cake
