Your Amanda may be the daughter of Nathaniel Marshall and Rebecca Wallace. She is listed as Amenda Angeline Marshall, born in Pennsylvania (very likely Crawford Co.), on September 29, 1827. Her sister Sarah Marshall is my great, great, great, grandmother. I am just starting to work on my Marshall ancestors. Most of the info I have can be found on Roots Web com. or Ancestry Com. and I believe Family Search might be helpfull. Hope this helps. Good hunting.