Even if you aren't let into the room, you can call her doctor and let them know. They need to know because if, in worse case scenario if she doesn't stop drinking, they will know how to better manage her pregnancy as she will be considered a high risk pregnancy.
Fetal Alcohol Syndrome, birth defects at NOFAS
You can give docs information about a patient. They just cannot divulge patient info to you due to privacy laws.
Please do it.