If your girlfriend got a itching down in her vaginal area , If there is a white cottage cheese like discharge ,She could have a Yeast infection
I would refuse in giving her oral sex unless she is willing to go get checked out at the doctors ..She could transmit that into your mouth And you could develop thrush
Thrush of the mouth is painful , Plus it takes a long time to heal up..I knew a friend caught thrush off of a dirty beer glass just by the bacteria that was left on the glass
You should go to www.google.com or www.webmd.com And search for information on Yeast infection symptoms as well , As thrush symptoms
Your girlfriends odor might be coming from her being sexually aroused too But she needs to be honest with you ..Okay ask yourself if she can't be honest about that Maybe she is lying about other things about her self ..Hey dude the ball is in your court
It is up to you if you want to continue having unhealthy sexual relationships with someone who your are not quite sure about , she needs to be upright honest with you And not play immature little girl games!!!
Best Wishes My friend