I also found a marriage for a Harriette Gustan (in Ancestry) who married a man named Enock Robbins on Apr. 08, 1853 in Effingham, Illinois. This would explain the connection to the name Robbins. Effingham County is next to Jasper, where she was found in 1850.
Kendall Dodd (presumed to be Harriet's brother) can also be found in Effingham Co. in the 1860 census, under the name K B Dodd.