Thanks, I'm excited for her to get experience.
Good attitude to have.
Is it absolutely necessary? No, there are other ways to gain experience, skill, and good coaching. I wouldn't out right knock it either as lots of kids progress through it.
Coaching traveling teams for boys and girls I have seen both good and bad. If the team doesn't fit her or the coaching style is toxic just look around there are other options AAU or not. Always try and focus on how she feels about it. This isn't the pros and right now she most likely loves the game, don't let anyone ruin that.
The boys do tend to get more push and more sponsors, but many top girls teams do too.
Try outs and costs vary by team/programs. I agree be wary of dad coached teams, I recommended that the parents go and watch the team play for an entire weekend before deciding. Competition reveals the good and bad so getting a sneak preview will weed out the really bad ones who shouldn't be coaching.
Winning or losing is improtant but the coaching moments and player interactions are what's big at this age.
Hope she has a blast and gets the experience she needs to continue her progress.