Its sorta cute that your Husband wants to do a party for her, for 16.
What does your daughter think?
I know you said she didn't think about it... but I would think, that amongst her friends and grade level peers... they would chat about it or not. If they are having one too. Or maybe it is not even something they think about.
What does she and her friends, talk about or say, about it?
Did you ask her?
I didn't have one when I was that age.
Neither did the other kids in my grade when I was that age.
Don't know what is the norm for those parties, nowadays.
Your daughter's seemingly "didn't think about it yet" reply, seems to mean that she didn't even think of a Sweet 16 party, herself. Probably because, she has not heard of one, at her school, per the other kids or older who was 16, once.
Inevitably, I would think it is up to your daughter.
If she doesn't care to have one, then don't.
Therefore, Daddy shouldn't push it, on her.
This not a "debutante ball" thing.
It seems your Husband just wants to have a party for her.
Does he have sisters... that had one at that age?
Maybe he got the idea, from that?
Or maybe, co-workers of his, talk about this as a HAVING TO do it, type party?
Maybe someone gave him the idea?
Mother in Law?