There are a lot of OB-GYNs who say that an occasionally glass of wine during pregnancy is okay, but many others who recommend abstaining completely. If your friend hasn't asked her doctor, she definitely should--about whether any wine is okay and about how much is too much.
What indreams said above is right on. No one really knows yet how much alcohol during pregnancy is safe. Some mothers drink throughout their pregnancy with no negative effects, while others might drink just a few times and still have a baby born with Fetal Alcohol Syndrome. Drinking earlier in the pregnancy is thought to be most risky, but there could be other times in later trimesters when the fetus is particularly vulnerable to alcohol for some reason. We just don't know. Just one night of heavy drinking is enough to cause damage.
But just one glass a wine a few times a week? Drinking smaller amounts does lessen the risk--binge drinking is definitely more dangerous. Many women have done that with no adverse consequences to their baby. I personally thought it was better to err on the safe side and completely abstained from alcohol while pregnant. No safe amount of alcohol has been established, and it is known that alcohol passes through the placenta to the fetus.
Click Here to search for a treatment center in your state that is right for you.