WI am trying to get the small amount of $863.03 from my deceased mom's bank account. She was living in Broward County, Florida.

I assume that there was no prior probate of her estate. If there was, then,you should have the estate re-opened. Otherwise, if you paid for any of your mom's last medical bills or funeral expense, you can usually go to the clerk of court Broward county with the reciepts and ask them to help you file for a disposition of personal property without administration. See FS Sec 735.310 If you didn't pay for any of these expenses, you'd probably have to file for a Summary Administration.