Have found a few possibilities for Ruth's parentage.
John Rummary & Philiadelphia Kemp married in 1803 so she could have been their first child - being born in 1804, their next child is baptized 2 yrs later in 1806 although it seems strange they baptized 2 other children before her - Elizabeth in 1806 & Reuben in 1809, Their next child baptized was David on 28 Apr 1811 - so I think this family is unlikely to be Ruth's.
Another alternative is that she was a child born late in a marriage. I have located a Richard Rummery & Ann Prior who had Abigal baptized 20 apr 1783, & Benedicta, Zilpah & Henry all baptized 25 Feb 1793.
There is also a John Rummery & Sarah, they had at least 7 children, all baptised between 1781 & 1800, Ruth Rummary & Henry Eastwood had sons called George, Henry, James & John - all very common names.
so...still no further forward with this one.......