The nursery rhyme appears to have originated from an oral tradition as most such tales do. Wikipedia and other sources point to several possible origins, all of which seem to have merit. The true source may be lost or has yet to be discovered and confirmed.
see link below
Little Bo Peep was created in 1805.
Little Bo Peep has lost her sheep.
Bo Peep is the nursery rhyme character who lost her woolly quadrupeds. The rhyme begins "Little Bo Peep has lost her sheep, and doesn't know where to find them."
Little Bo-Peep - 1917 was released on: USA: 25 April 1917
Bo Peep Bo Peep was created on 2011-09-28.
The cast of Little Bo Peep - 2007 includes: Phillip Roebuck as One Man Band
unknown
A female Shepard
Cybill - 1995 Little Bo Peep 3-14 is rated/received certificates of: Argentina:Atp
Her sheep. -_-
Super Why - 2007 Little Bo Peep 1-19 was released on: USA: 21 January 2008
Cybill - 1995 Little Bo Peep 3-14 was released on: USA: 20 January 1997