Make the ranked matches better

Im s2 and i recently got into a match in which someone in my team was unranked, it was one of their first games in i don't know when since you could only see the game that I played with him in his match history.As you guessed we lost, and I got really mad. This player was a morgana support and pretty much made the whole team lose because the player fed, did not ward objectives and kept getting caught in the jg by herself.We kept telling her to ward objectives and to not go alone in jg without wards but she never listened.I have gotten a lot of these players that are unranked but I never bothered saying anything since I kept thinking that i would stop getting these players and get people in my own division.At first i thought she was trolling since she did not have any masteries and she would just die and not ward objectives but now that i saw her rank I get it but, it made me lose lp because of it.