I'm sorry about your fall out. The truth is your sister doesn't know anything about stuttering and jumping to learn and work on a bunch of techniques likely isn't going to help. It'll more likely make you feel worse because stuttering is not your fault. Your sister is the one with the problem. Don't let her shatter your positive self image as a good communicator who happens to stutter. That is who you are and her impatient opinions don't change that.