The book is Strong Female Character by Fern Brady. There have been several occasions in the past year where friends have asked me if I was autistic and my answer was typically, "probably not." I knew I shared certain traits with autistic friends but I thought it had to do with my anxiety problems.
For me lurking on ADHD sub-reddits. I noticed a few people were giving advice that worked so well or made so much sense, that I looked at their profiles and saw they were heavy in autism communities.
Then I watched this 5 minute video and cried for 3 hours at how fucking seen I felt. https://www.youtube.com/watch?v=cTzUbe5hoI8