I am not sure I trust my sources completely.Brewers can be very confusing in this timeframe and in New England.This is what I have in my database.Another post will deal with hard copy info.
I can not confirm that your Abigail Brewer was the daughter of Lt. John Brewer (b 1669 Sudbury MA d Watertown MA).Lt John married Mary Hanna Jones (b 1672 d 1729). According to my sources their children were John (b 1698), Mary (b abt 1699), Josiah (b 1702), Daniel (b 1689), William (b 1707) & Submit (b. 1709).No Abigail.
The son, Capt John (b 1698) married Hanna Merriam (b 1701) one of their 12 children was an Abigail b 1719 in Weston MA.
The son William (b 1707 Watertown) married second Abigail Garfield (b 1711 Watertown) and on of their 9 children was an Abigail christened in 1735 in Watertown.
My sources are secondary.Sandra Stuphin Olney "Passengers on the Lion" (Heritage Books:Bowie MD 1992) often cited VR of various towns.A Brewer cousin sent me the Brewer lines Olney had in her book.She lists all children of Lt John as above.She does the same for Capt John.A couple of other secondary sources do not quote their sources but generally confirm Olney's data.