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From what I've been reading, I think ths Joan's name was actually Margaret. I've been researching these connections all night and found a number of questionable connections, started several discussions under the profiles for her husband Robert Brent and his parents.
Anyway, the profile notes state:
Their son, Sir John Brent of Cossington, married, first Ida, the daughter of Sir John Beauchamp, of Lilisdon, Knt., by whom he had Sir Robert, who succeeded him in the estates of Cossington; and, second Joan, the daughter of Sir Robert Latimer, Knt.
A son of the second marriage, Sir John, succeeded to the estate of Cossington (upon the death and exinction of the line of his half-brother, Sir Robert Brent).10
' His son, Sir Robert, married Margaret, the daughter of Hugh Malet, of Currypool.'