It is your own insecurity and doubt that makes you react so virulently to Susan. Quite possibly she is a true friend who wants to make sure you are doing what you are doing with your eyes open. She doesn’t have the luxury of believing, as you seem to have, that this time around you are more mature.
Most people have a Disney view of support: “I’ll affirm your choices no matter what you do” as opposed to “I’ll question your choices to help you stay on a better path”. I’m lucky to have friends who ask hard questions of me and some who’ve kept me as a friend in spite of my hard questions. Keep Susan around, she’ll come in handy.