These are all true, and that someone can then proceed to suggest she has FAS, which is pretty much the polar opposite of having exceptional verbal skills, just shows how vile and twisted this climate have become.
Disagreeing with someone or something happening doesn't justify and kind of attack you can cook up.
I do not for a second believe there is any acting involved. She is dead serious, and she most likely writes everything herself. As you said, people with asperger can be obsessive, and may have an ability to research something they're interested in to a degree that's almost impossible for ordinary people.
Taking a step back to gain perspective however, can be difficult. But everyone's different. I've dealt with kids with asperger who were for sure obsessed, but had no ability to fully absorb what they were obsessive about.