Hey! Welcome! There's a great journal out there called Where I Am Led that helps guide submissives on their path.
I've also written a book about my transition from a vanilla, egalitarian marriage to one of kink and power exchange. You can check the reviews on Amazon and if you/she would like a free author's ebook copy I'm happy as always to send one. Paperback is available there too if she'd prefer. Shoot me a DM with your preferred email and I'll get you an electronic copy if you would like.
Here's the link to both:
Where I Am Led: https://www.amazon.com/Where-Am-Led-Exploration-Workbook/dp/0578035952/ref=mp_s_a_1_1?keywords=where+i+am+led&qid=1563535065&s=gateway&sr=8-1
Darling Discovered: https://www.amazon.com/Darling-Discovered-True-Story-Submission/dp/0997421916/ref=mp_s_a_1_1?keywords=darling+discovered&qid=1563535127&s=gateway&sr=8-1
I find this workbook “Where I Am Led: A Service Exploration Workbook a tremendous workbook along the lines of what you are seeking.