Whatever Happened to Angeline Hayes?

My search to find information on my paternal 4X great grandmother Angeline Hayes has played out like a unsolved mystery.  One minute she's there and the next...poof gone without a trace.  Angeline a mulatto was born into slavery around 1829 in Georgia.  She was sold to Koonce plantation owner of Henry County, Alabama.  While on the Koonce plantation, she possibly married George Hayes (a mulatto) there on the plantation or before she was purchased and she had two children (Ella and George) with him.  She also had children by Koonce, before and during her marriage to George.  According to family lore, Koonce sold George to his family member nearby plantation to get him away from Angeline. 

Angeline doesn't appear anywhere until 1880.  She's now 51 years old, living in Bascom, Florida with her three children (Clopton Koonce, Ella and George Hayes).  Just as quickly as she appears, the ever so mysterious Angeline vanishes never to be heard from again.   

What happened to Angeline? Did she pass away?  Did tragedy strike?  Family legend has it that maybe she just up and left, went on her merry way.  Time to put on my detective hat and channel my inner Colombo and solve the mystery of her disappearance.