The owner of a Gallatin grain company pleaded guilty Tuesday to her role in a mail fraud conspiracy.  Pauline Froman, 66, admitted to stealing more than $3 million from 100 northwest Missouri farmers.  Her husband, Daniel Froman, 66, pleaded guilty to the same charges on Oct. 18.  The Fromans owned and operated Gallatin Grain Company, which stored and bought grain from area farmers.  The two have been charged with 22 counts of stealing grain and three counts of filing false reports.  The Missouri Department of Agriculture has collected $400,000 in assests.  According to the plea agreements, Pauline is subject to a sentence of up to five years in federal prison without parole and a fine of up to $250,000.  Daniel could receive up to 20 years in federal prison without the possibility of parole and a fine of up to $250,000.