The IGI has her born both in Lincolnshire and in Cornwall. I cannot find her either on the Heraldic Pedigree (which is accurate for the period we are dealing with ) or Burke's Landed Gentry as being part of the Lincolnshire Lincolns. That doesn't mean she isn't, just that she isn't there. My guess is that she is from the Somerset branch. Sorry I can't help more. I'll keep my ears pealed.