She's obviously just bored and trying to amuse herself by asking you these questions. If she happens to get a mildly "crazy" response, you can bet your bottom dollar that her and her uptight clique will be giggling over it during the next lunch break.
So sure, she's interested in you, but only for her entertainment, rather than any romantic interest.
Seriously, if a girl is interested in you romantically, she wouldn't be bombarding you with such generalised, stereotypical and quite frankly, offensive questions. I'm sorry, but "do you like sex with transsexuals" is definitely not a pick up line.