To amend my earlier post, I think the Do (Ditto) could be referring to Lincolnshire rather than specifically Wigtoft.
That would suggest she was born in one of the extraparochial areas I mentioned, in which case a baptism could have taken place at any convenient church.
Just to second arthurk's reading of this, I agree that it reads Do [i.e. Lincolnshire] Extrapal parts Nr Swineshead. I remember reading in A history of the Fens of south Lincolnshire that there were dozens of extraparochial areas in the fens around Boston which were slowly merged into parishes or became parishes in their own right.
Arthurk
As you say, I think it is Extrapa[rochial]
Thanks everyone.