So I am a group lead for a group of people for a manufacturer. Last month a new girl started and as soon as she did our other older employees didn't like her from the start. They would talk about her behind her back. And be really snotty towards her. I told this to my supervisor, he just said to monitor it. It was getting worse. They never picked on her in front of her face but still when she was away. I told them they need to stop. Finally one day, the girl just up and quit and walked out. This was a month ago. She said she had came to me and I did nothing. I talked to the group of women and told them they need to stop. After this, a lot of what they did was when I was away.