My girlfriend has been drinking all night and I really don't think she should have another glass of wine.
Why don't you want to let her have another glass of wine?
I'm afraid she'll do something stupid and it will ruin my life.
It is ok to ask someone to not drink as much if it causes problems. If you think they have a drinking problem you can try to get them professional help.
I'm just saying she should learn to control her drinking.
I understand where you're coming from. If she is getting too out of hand then you should leave the area you are at and get some rest for the night. Try to have a talk with her tomorrow about her drinking.