My daughter(now 19 years old) was diagnosed with Bipolar 1(mania) when she was 11 years old. I had never considered Aspergers as a possible cause for her behaviors and quirks over the years, until recently when I began learning more about the different characteristics of Autism. I wish I had known then, what I know now, because I would have interjected this possibility to her Dr.
Her symptoms seemed to escalate once she started the med marry-go-round they put her on. She's been med-free for over three years now, and all is well with the mania/depression. A person goes through a lot of changes between the ages of 11 and 19, so perhaps she's learned some better coping skills for her feelings over the years.
The internet is a good source of information(some good, some bad of course), and you should investigate both Autism and Bi-polar disorder to get a better idea of which direction you may be leaning. Good luck to you!