« Reply #1 on: Wednesday 16 July 14 18:52 BST (UK) »
Sarah Breyer baptised 23 March 1686 Offley Hertfordshire (before parents marriage?)
Until 1752, the start of the new calendar year was the end of March. Sarah Breyer's baptism was therefore in March 1686/7 rather than the beginning of 1686. If you check out the original entry which is viewable on FindMyPast, you'll see this.

Therefore, I don't think you'll find she is the Sarah Adams marrying in 1712, she would have married as Breyer. Even if she had been born before the marriage, the fact the parents married would have meant she would most likely have married as Breyer anyway.
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