I think when she went to visit her family she did not know her mother was alive. Before the mother came in she was sitting on the bed with the boy. She heard someone come in and asked who is that. See looked surprised and tied to leave. Also at the very start of the show when they show clips from past episodes they said her mother and father were both dead. The scene at the end was very powerful. She was in a lot of pain. She was also wearing the outfit her mother give her. If you go back and look at the scene in the kitchen again. When she asked her mother to clean her face. I think she wanted a connection with her mother. I think she was willing to forgive and start over. I think one of the reasons she was in so much pain at the end. Villanelle knows she can probably never be able to see her brothers again. --- update Saw episode 5. Villanelle knew her mother was alive and would be there. I guess she thought she was ready to see her mother again but was not.