When she does it, take the juice away and say it's for drinking, not spitting. Explain why spitting is unacceptable to you. If she goes crying to her mother, h

When she does it, take the juice away and say it's for drinking, not spitting. Explain why spitting is unacceptable to you. If she goes crying to her mother, her mother should back you up. She can have her juice back once she agrees to drink it and not spit it. If she does it again take it away for a longer time and repeat. Physical violence is not needed, you don't treat adults that way, children are people too.