Ruth's Mameh was a good mother because although she couldn't see and she was constantly abused by Ruth's father she still cared for Ruth. For example, when Ruth got pregnant she didn't tell anyone. In fact, she sent Ruth away. Many people may say that sending Ruth away is just running from the problem but I think she sent Ruth away because she cared for her. She knew Tateh would kill Ruth as well as Peter.
Ruth learned what not to do from her parents, especially her father. Her father mistakes taught Ruth to not judge people by the color