Hi Jeff, Although I am unrelated to your family, I was browsing the message boards the other night and became intrigued with your Catherine Lippert.I found something today that may help you, maybe not.
On June 17, 1837, a marriage was performed by Thomas Pogue, JP, for Frederick Strathman and Margaritta Lippert, as recorded in Book B of marriages for Morgan County.I read the posts about the Lippert families in Cass County, and feel that is probably where your Catherine comes from.Meredosia, IL, is closer to the Cass Co. communities of Arenzville, Beardstown, etc. than it is to Jacksonville, the county seat for Morgan Co.
You could write to the County Courthouse in Morgan County for a copy of this marriage license, asking them to include any notes or letters giving permission to marry that may be included. If Margaritta was not yet 18 someone had to give permission, and if not one of her parents then the note usually explains the relationship between the signer and the bride. Good luck in your search!