Benjamin Gill, of St. Andrew's, Holborn, tailor, and his wife, Mary (also called Anne), were indicted for recusancy in 1626 and subsequent years. This would seem to indicate that they were married no later than 1626. 
They had one daughter, Anne Maria, wife of [Capt.] James Neale, Gent. 
↑ see also: Various FAMILY TREES: b. 1590/1605 Windleshaw, Lancaster; Death: 26 NOV 1663, Prince Frederick, Calvert County, Maryland; Geni.com; U.S. and International Marriage Records, 1560-1900. Yates Publishing. Ancestry.com, 2004.
Mary Mainwaring was married to Benjamin Gill no later than 1629, probably by 1626. They were still married when they emigrated to Maryland in 1642. She could not have been the same person who married Robert Brooks in 1635. There is no mention of Brooks name in Douglas Richardson's documentation. The connection to Robert Brooks should be severed.
↑ see also: Richardson, D. (2011). Magna Carta Ancestry: A Study in Colonial and Medieval Families, 2nd ed, III, p. 128. Kimball G. Everingham, Ed. Salt Lake City, UT.