It's not normal, but she may have a medical problem with her ability to smell. Most people smell themselves before anyone else does and can't stand their own smell when it gets too strong.
Maybe you can discreetly tell her mother and her mother can talk to her. Just tell her mother not to mention you told her. If you don't know her mother, you try to have a heart to heart talk with her.

If your nose gets used to a bad smell, you get de-sensitized to it. be a friend and hand her a speed stick.

just hit puberty and doesn't realize yet that she needs to use deodorant (or better yet, antiperspirant). She also should wear lighter (less warm) clothing and bathe once in a while.

Maybe you could guy her a gift basket that has bodywash,lotions, and DEODERANT in it. I think this would be a subtle way to get her to take care of the smell.

Whether or not you decide to tell her, be sensitive to her feelings and a good friend.

*LOL* I've worked with two different people at two diffent points in my life that had this problem. Ya really can't say anything. It's really incredible that they can't seem to detect their own overpowering scent.

i would tell her drends and tell 2 tell her 2 buy some deoderant

I know of someone at my workplace who's wife is extremely allergic to scented products. It's so bad that even unscented soaps can't be used in the household.

If that is not the case with your friend, offer tough love and hand her the speed stick.

To answer your question "Is this normal for her not to notice her own stench?", yes, it's normal. Most people can't smell their own scent; or more specifically, after being exposed to their own scent for a while, they get desensitized to it.

Is she a muslim they stink

Look at it this way, What she is experienceing is what I like to call, "The new house theory".

When you enter/move into a new home, one of the first things you may notice is its distinct smell. Overtime, this smell fades into, well, nothing. You just don't seem to notice it anymore. She is probably experienceing the same phenomona. The best thing you can to is shove her into a small box until she evntually smells her own feces, making her fear awful smells.