If she is on the sauce a bit, there is no direct way you can help. There are indirect ways - leave a few pieces of AA literature around your house if she visits. The AA number is in the phone book. It is vital not to make a big issue of it, as people who do drink try to hide it.
Sometimes people have a hard time and turn to the bottle, other times they may be alcoholic, which is no big deal as long as you know to keep off it. Whichever one a drinker is, they need to be able to talk to someone who knows about drink related troubles - this could be a doctor, though they are not usually as good as alcoholics who do not drink.
If, gently, subtly and sensitively you can get your friend to talk to someone in AA, she will find a friendly, kind and well balanced person who will like talking to her. She may not be an alcoholic, but have reached for the bottle in a bad situation, but perhaps needs a bit of support from other people like her.
I have been in the same position as her, and found that by putting the bottle down life gets a lot easier, and problems seem to melt away.