BO in a 6 year old girl??

My step daughter has her well child check coming up and I’ll bring it up then but I was wondering at what ages did your girls start needing deodorant? My girl has been giving off BO since around 5 (usually when she didn’t shower for a day or was very active) but now she’s 6 and she’s giving off BO even after showering and regular daily activities.

I was a LATE bloomer so does 6 seem young?? It seems super young for me.

We did get her an all natural aluminum free deodorant that does help a lot! But I’m a little scared of what is coming next 🤗