@IluvTwilight,
How old are you iluvTwilight?
Have you considered that there might be a very good reason she won't tell you?
I think everyone should have the right to know who their parents are but you might have to wait until you are 18.
A lot of adoption websites have message boards where you can list your personal info (birth date, place of birth, last name) and see if someone is searching for you.