You must be alerted and very careful from such person whom you think her a friend. If you want to continue your friendship with her, you must be clear and frank with her that she Must stop major sins. If she listens to you and leave committing major sins then you can cont8nue talking to her with being alert, but if insists on committing major sins, you Must leave her and stop dealing with her completely. Such bad friend can ruin you if you continue with her. Millions of people like you were ruined by such bad friends. It for you to decide to save yourself by leaving such bad friend, or ignoring the risk on you from her and continuing friendship with her, but you will definitely repent and feel very sad in the future.
Bad friend is a window to disastrous future and we must be brave enough to keep them away from our life before it is too late.