I have been trying to find information on a Mary Tegan, born Sept. 16, 1850, Minnesota. She died in 1909, Missouri. She was married twice, first to William Harbke in Illinois, then to Juergen Meyer. I'm looking for her parents and/or siblings. Since her birthdate is close to your Elizabeth Tegan, perhaps they are related. Spelling of her last name could be Degon or Tegan. I've also seen Tejan. Some nationalities include Denmark, Wales, England. I haven't found anything that gives a direct connection.