I think I have found your Ann Eccles, born about 1754 in Alston, Ribchester, in the Catholic returns of 1767. Her Father was named Thomas, b1714, baptised to Seth Eccles and Ann Gregson on 12 Sep 1714 in St. Wilfred, Ribchester. Thomas was a Tanner and married an Ann, born about 1711? He was buried in St. Wilfred on 7 July 1777. They had at least seven children: Alice, abt 1753, Ann, abt 1754, Mary, abt 1756, Seth, abt 1759, Edmund, abt 1761, Elizabeth, abt 1764, and Thomas, abt 1766, all in Ribchester. They're also living with an Ann Eccles born in 1727. It's possible this is his wife and the other (b1711) is his sister? The returns don't say. Note the children named Seth and Edmund!