I believe these are different Sarah's. The Sarah who I believe is a sister of my John Jr. , was married April 19, 1842 to Decatur Ford in Coles County, Illinois. Sarah and Decatur Ford lived next door to John Fickes Sr. in the 1850 census. She was age 41 in 1850, and was born in PA.
Now, there was a Leah Fickes, daughter of John and Mary Rudysill Fickes. This Leah was born in 1807 in Shippensburg, PA. She married Amos Stoddard, and to my knowledge, was her only huband. I am pretty sure this Leah was also a sister of my John Jr., but I am not sure yet. I don't know if her middle name was Sarah.
You may have this already, but here is the e-mail address of someone else I have come across researching your Sarah: Bill <firstname.lastname@example.org>. Sorry I couln't be of more help. If I come across anything I will let you know. It's possible that these people were related somehow-I just can't figure it out yet!