This is retarded.
Does she deserve to be charged with a felony? Yes, but she doesn't deserve and won't end up being sentenced with a felony. She broke a law classified as a felony. Being drunk is not an excuse, if it, were I wouldn't have gotten into any of the the trouble I have during my life.
Will she end up with a felony on her record? No, this will likely plead down to a misdemeanor because 1.) it's her first offense 2.) she's white and moderately cute 3.) she has a college degree.
She fucked up, even though she was fucked up, and now she has to play the legal game. That will probably be a better lesson for her future than most of the things she was taught in school.