Lady, child and horse on the prairie of Oklahoma

This photo was found in my grandmother's old photo album (Irene Meehan Samples). It is a wonderful old photo of what appears to be a mother with her child on the praire in the early 1900's. The location would be Jackson, Roger Mills or Beckham counties. The surnames would be Sollers, Samples, Meehan, Murphy, Smith, Wheeler, or others.

I am hoping someone has a photo just like this one and can tell me who they are.