Being drunk and getting married goes to capacity. It is grounds for an annullment which is up to a Court to decide eitherway.
Your friend needs to check this out. She could also be considered a polygamist and be subject to criminal prosecution.
I remember reading that there was a teacher and principal, who were already married to other people, that were drunk and got married in Vegas as a joke.
They were from somewhere in South Texas, I think Brownsville.
The local paper got a hold of it, published the story. They were fired and there were threats for prosecution for polygamy. I never heard what eventually happened.
If you friend is in a public job, she also needs to be careful.