How to tell a friend they need to shower more often?

Hello, i have this 'friend' (whore that think im her friend) that never showers...Her brother told me this (its because she doesn't want to wash her hair because it takes to long) Anyway...Shes in all of my Academic classes and a lockers 4 away from me. the smell is Disgusting...foul...its a mix of Cigarettes... Alcohol(beer,wine)... Burnt hair...and body odor...to me is doesn't seem like she wears deodorant or perfume... if she does it doesn't work. Its not just me who notices the stench coming from her. whenever she walks by someone they have to cover there face..nose...sometimes i drop a few hints like saying "EWWW it smells bad over here..not directly saying it to her face but so she hears it. I sort of feel bad for her becuase she already gets bullied alot for being a little overweight. her Afro type hair..and a few other things. She tells me a lot of stuff and i tell her some minor stuff. What would be a kind way of me and other friends of approaching her nicely and asking her to shower?