She smells

Recently I noticed that my friend has a lot of hair under her arms, there’s nothing wrong with that of course she can do what she likes with her body. However I also noticed that she smells bad like sweat and I can’t help but think it might be because of the amount of hair there because before leaving the house I saw her using deodorant and she was just after a shower so her overall hygiene isn’t bad. What do I do? Do I encourage her to shave them, even trim them slightly?