I deleted a post here but will suggest that the OP is correct in how the majority of college coaches view parents coaching from the sidelines. The OPs daughter, imo, was simply repeating what she has often heard from other college coaches during the coaching process. Even carrying a dd's bat bag is considered a no no by most college coaches.
If my DD is fortunate enough to pitch in college I do not expect I will be taking her to weekly pitching lessons or sitting on a bucket 3-4 days a week while she is in college, at that point I will have to step back and let the college coaches do their thing.