With all due respect, I disagree.
I believe that she's sincere and here's what I've learned about her -
She's a libertarian and a student of Austrian economics. I'm not certain when she started using the "Amanda B. Johnson" name but before that she was known by the name Amanda Billyrock. Perhaps she's married now (she often refers to some guy in her newer videos as her 'manservant', lol) and her husband's surname is Johnson.
In any event here she is back in 2012 with Ron Paul:

Here she is interviewing Ron Paul in November, 2012 (video uploaded in 2013):
https://youtu.be/psbgNCTTEnY
Here she is with Jeff Berwick on the TheAnarchast show in December, 2015 (Jeff wants to know where she's been for the last 2-3 years since their last interview):
https://youtu.be/5jI8ngmo7Yg