T2, I'm glad you had a chat w/your stbMIL and she's understanding and is very much aware that her daughter is still trying to sort things out. She's right...she needs therapy, but only she can decide to get the much needed help she requires.
On another note, you sound great and your life is unfolding in many ways that will be wonderful, fun and exciting. Embrace all that comes your way, i.e., be it happy or sad. Life is an adventure and one that we must not stop and become stuck in. Experience it all and above all else, live your life to the fullest.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.