My daughter decided to stop wearing deodorant at home

[TheVividDuck]

I'm a mom of a 16 year old daughter and for some weird reasons she stopped wearing deodorant at home. She's an athlete and she works out a lot so obviously she's killing us with her smell. I have an 11 daughter and I'm married to another woman. I'm bisexual. My wife tries very hard to give a diplomatic answer but if I press, she admits my daughter's smell bothers her.
My younger daughter isn't so subtle. She makes fun of her older sister and she blatantly tells her that she stinks. I am not so harsh but I have told my daughter that she smells. She told me some things I don't believe are biologically true. She said her body will adjust and eventually she wouldn't smell anymore. She said most girls and women don't need deodorant and we only stink because we don't allow our bodies to regulate itself.
I'm honestly considering threnthen to ground her if she doesn't start using deodorant again. The idea feels authoritarian but I'm at my wits end.

I used to use Mitchum. During lockdown, I switched to wild. I did smell terrible for a few weeks, but since that initial whiff, I only smell now if I don’t shower everyday - as in, I can sometimes smell a bit whiffy when I wake up in the morning, having had a shower the morning before before I have a morning shower, but the wild deodorant keeps the smell at bay for a good 18+
hours.
she needs to use SOMETHING. Is she getting muddled up between using anti-perspirantd and deodorants and thinks it to means to use nothing?

Just tell her that her smell isn’t acceptable to the rest of the household, it’s unfair to subject them to it, and buy real soap.