If she is gettin a little smelly then it is probably because she A.doesnt shower often (which probably isnt the case) or B.she has an infection and should go get checked out.
I am sure that she is aware of it and maybe you should just let her figure it out cause i am sure that you would hurt her feelings if you said anything. JMHO though. I dont know how sensitive she is to these things though. Has she recently just started the pill?