AIBU to not think DD is overweight?

[Strugglingonagain]

So DD in reception was seen by school nurse today. I put her details into nhs bmi thing and it said she's overweight.

Now I see lots of posts on here by parents saying their child isn't overweight when sometimes they are.. But! I know my DD is not skinny in the slightest, however she is also very tall. So my question is.. if you are 91st % for weight but also 91st for height is that ok or should you still be less?

And AIBU for worrying about this so much?

DS was marked as obese in reception, we knew he wasn't, just tall and still with a bit of puppy fat. Three years on he definitely one of the thinner ones, not skinny skinny but visible ribs and he also has the clothes too wide problem. IMO the weighing in reception is pointless, many of the OK ones from my Ds's year are now chunky. Just keep an eye on her.