Because she is drunk comes after the daughter in sentence, so its the daughter who is drunk. If its drunk mother beats up daughter, totally different type of sentence.
Well I'm not very good in English doI would like to know the answer, I guess it's the mother coz the subject is over her no?
The pronoun is ambiguous because it has 2 antecedents
Why so many words start with a capital latter?
it's 2022, we need to know each person's preferred pronouns before we can answer this question.
Tom hit a stop sign, because he was drunk was tom or the stop sign drunk ?
the mother as the sentence is referring to her - the mother beat the daughter, because she (the mother) was drunk.
Who names their daughter 'Because'?
The mother, because there is in no comma and the action revolves around the main character.