You don't need to get drawn into the "well X didn't deserve her place" conversations.
My ds is a swimmer. 99% of parents are normal and pleased for their own and others children for succeeding.
A few seem to think that because their kid is good at 12 they'll be always top and destined for the olympics - and not only steer every conversation to how great their child is but worse - tell their children off for not winning or getting a PB.
I would give facts. She's attending X comp - will we see you there? If asked. I wouldn't volunteer information or get into discussions about what she's doing. Just say the coach likes to confirm nearer the time as she's still so young.
Don't respond to anything about other children. Just don't even act as if you've heard it or read it.
Just concentrate if supporting your dd and making sure she's nutritionalised well, has a good sleep/ training balance and a good sport/life balance.
It's amazing how many children will drop out at 11/14 or 16 from elite sport.
It's then I actually do feel sorry for the insufferable parents who've lived their past years through their children's sport.
I always think as long as you aren't that parent you can pretty much ignore those who are!