Unless you are a PC you most don't really know enough to make good in game comments. I don't think what you are doing is bad but I would make sure she is OK with it. It's not fair to the kid to have the parent try and coach them during a game if they don't want it done.
I catch my daughter at lessons and am trying to learn what she’s being taught by the PC as much as she is. IME, she doesn’t improve at the lesson. She learns what she needs to work on at the lesson and improves in BPs and games outside of the lesson where she applies what she learned at the lesson and grooves it into her muscle memory. Since I’m catching most of those BPs, I tend to giver her a lot of feedback on what she’s doing/not doing based on lesson content.
At 8, it’s about development more than winning so I wouldn’t feel too weird about offering in game correction as long as the coach was cool with it. TBH, I sometimes do this with my daughter and she’s 13.
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