What do I do with my sister?

[ALN09]

Try talking on topics she has knowledge of or the topics she is curious or likes to talk, ask her to help you sometimes or for a walk together, make it a habit and don't expect an immediate change. If she has a different nature, it would take time to change. Any person would generally talk when he/she needs/wants something from you, note it when she is willing to talk or need something, keep your conversation positive, ignore her when she is busy elsewhere or you got work. Keep trying.