have you tried to get a copy of her birth certificate?
if she was in fact born in MD-
http://dhmh.maryland.gov/vsa/SitePages/birth.aspx or OK
http://www.ok.gov/health/Birth_and_Death_Certificates/Birth_...adoption records in MD
http://www.dhr.state.md.us/adoption/Hope this helps.
I live in MD if you need anyone to help you here
feel free email me to ask for additional help