FreeReg also has a possible baptism for Phebe Cottle in 1759 in Dunkerton, which is only about 2 miles from Camerton. Her parents' abode is given as Wellow, about 5 miles from Camerton.
http://freereg.rootsweb.com/cgi/Sear...cordID=1709085
However, a Phebe Cottle from Wellow married a Jonas College in 1795, so it doesn't look as though she's yours.
http://freereg.rootsweb.com/cgi/Sear...ecordID=581097