Trying a search for birth of Barbara Newman in England from 1640 to 1695 (years I just plucked out of the air), there is one contributed result on the IGI:
birth 1682 Evercreech Somerset father Richard Newman, mother Grace Edmonds
..... and one indexed result:
chr 2 Dec 1663 St Edmunds Salisbury Wiltshire parents John and Barbara
Changing the parameters will probably yield different results.
Even with only one or two results, there is no way of knowing which, if any, are your Barbara. We don't know her year of birth, place of birth, whether or not Newman is her married name .... births possibly not registered, records lost or damaged, plus any number of other possible scenarios.
Frustrating though it is I suspect you will never know for sure if you have the right Barbara.
Where the seller got the sampler from (location wise),
might help?
