keyword there is was, meaning not anymore. neither of them. the first verb in the sentence is present tense, and the "was" indicates that she isn't drunken anymore, which switches to past tense. neither of them.
it’s the mother because general rule of thumb for personal pronouns (he, she, it, etc.) is that they refer to the last noun used. So in this case, we would infer that it was the daughter who was drunk, because she was mentioned last.
*TO ALL THOSE PEOPLE WHO THINKING THEY KNOW ENGLISH HERE ANSWER THIS *; *A MOTHER BEATS UP HER DAUGHTER BECAUSE SHE WAS DRUNK*; QUESTION : WHO IS DRUNK ? *I'M WAITING *
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