I saw this too, and there is another one about 30 years earlier. It does look too early for your Rebecca, but at least it shows Rebecca was a family name. I think you need to check the birth years of Rebecca's children, to see if it is in any way possible.
I was interested in the 1809 baptism of an Elizabeth to Joshua and Ann, possibly named in tribute to the Elizabeth daughter of Thomas, who had recently died. Other than Elizabeth the Joshua and Ann children all had old testament names. (I'm assuming Joshua and Thomas, both in Dodsworth, are related).
Don't forget to look at the images on Ancestry! There's often other information such as abodes and the indexing is far from perfect. You can browse through too - I've found some people who haven't been indexed this way, easier if you know the birth year roughly.
Anne
Anne