You probably aren't very good at picking pitches.Yes, if she uses the same grip for multiple pitches then why worry about it. Or, if the grip change is too subtle to be detected. If I can't pick the pitch when I'm catching for her, and I make it a point to look, then I don't see a reason to be concerned.
Let's assume you want your DD to play in college...here is the deal:
Your DD will play a pre-conference schedule made up of a variety of teams, and then the conference schedule. Then, whoever wins the conference tournament gets to go the NCAA tournament.
The HC gets a bonus for winning the regular season conference, the conference tournament, etc. So, there is real money at stake.
Suppose your DD is the #1 pitcher at Ohio U (just for grins). Guess what? She will pitch against every team in the conference twice during the regular season. Then, she will have to pitch against those teams again in the conference tournament.
So, during the games, there are usually at least three coaches plus two pitchers and a catcher watching every pitch your DD makes. They are trying to find a way to pick her pitches.
Assuming your DD gets to "the big game" in the conference tournament, the opposing coach will call her pals in the conference asking if they have any info on your DD.
So, your DD's motion gets dissected. If there is any way to pick a pitch, they will find it.
I told the story a few weeks ago...but, two years ago I helped my DD pick pitches from a HS pitcher. We didn't pick her grip, she did something in her pre-motion that gave away her pitch.