Just some (personal) general tips:
As far as pitch selection I would really examine your role in his process. Your random isn't better than the catcher's or coaches random. Your daughter should throw her primary pitch early and often in all areas of the zone and at different speeds. There isn't some magical pitch-calling sequence that will lead your daughter to success (or defeat).
- don't throw a changeup over the plate (it should be on the edges of the strike zone);
- try and throw a strike on a 2-1 count;
- don't give up hits on a 0-2 count;
- throw on the high side of the strike zone if you are 100% sure it's a bunt (or they should be bunting).
- try and "miss" at various ball lengths depending on the count
Hitting is timing, pitching is disrupting that timing.
This is the kind of thing I'm looking for. And I'm definitely not expecting a recipe for success....just some general rules she can implement as the at-bat progresses, or situationally based on number of outs, runner position, or very obvious pitch preference or swing tendencies by a batter. That kind of thing. I'm looking to help her learn the job. This season while working out, I helped her learn to focus on the psychology. Controlling her emotions, lifting up her teammates, etc. She far surpassed my expectations there.
We know some of those situational things, and the MS head coach (also new to softball but a lot of success with baseball at all levels) probably knows them all, but we weren't in a position to call pitches and she's no longer in MS. I don't intend to call her pitches unless I'm asked to do it. I'm on the field with both schools in the offseason but I have no idea what my role will be with the HS. I'll be around, but not necessarily in a dugout/on-field role. I honestly would rather just watch games as a parent for the first time, and work with the pitchers during practices.
We did try calling pitches in MS once this year with an arm band, because our primary pitcher's mom requested it. The situation was complex and delicate, and too long (even for me) to describe, but we gave it a shot. The kid didn't even acknowledge him or even look at the band. We just let her mom continues call the pitches with hand signals from the stands. She's a very hot and cold pitcher, so sometimes it worked very well and sometimes maybe 50%. We really weren't in a position to resort back to the more reliable pitch, which was a fastball down the pipe, because decent teams destroyed it.