Sadie, I went through all the census records for Spartanburg County that I could on the USGENWEB site. This is what I found:
1860 Census - Spartanburg County, SC
Grassy Pond - page 183
John Turner age 62 farmer Susan turner age 61 POLLY TURNER age 30 (thus b. 1830) Nancy age 19 July H. age 17 (Julia H. according to other) Amelia J. age 15
I don't know if this is the Polly Louisa Turner you are seeking, but it might be - I didn't see any other Polly or Louisa listed as a Turner. But some say Chesterfield Bright was born 1833 so it would fit.