Edward and Eleanor allowed her mother, Joan of Dammartin, to raise their daughter Joan in Ponthieu (1274-78). This implies no parental lack of interest in the girl; the practice of fostering noble children in other households of sufficient dignity was not unknown and Eleanor's mother was, of course, dowager queen of Castile. Her household was thus safe and dignified, but it does appear that Edward and Eleanor had cause to regret their generosity in allowing Joan of Dammartin to foster young Joan. When the girl reached England in 1278, aged six, it turned out that she had been badly spoiled. She was spirited and often defiant throughout childhood, and in adulthood remained a handful for Edward, defying his plans for a prestigious second marriage for her by secretly marrying one of her late first husband's squires. When the marriage had to be revealed because Joan was pregnant, Edward was infuriated that his dignity had been insulted by her marriage to a commoner of no importance. Joan, at twenty-five, reportedly defended her conduct to her redoubtable father by saying that nobody saw anything wrong if a great earl married a poor woman, so there could be nothing wrong with a countess marrying a promising young man. Whether or not her retort ultimately changed his mind, Edward restored to Joan all the lands he had confiscated when he learned of her secret marriage, and accepted her new husband as a son-in-law in good standing. Joan marked her restoration to favor by having masses celebrated for the soul of her mother, Queen Eleanor.
"Married (1) in 1290. Married (2) in 1297. She had 4 children by CLARE & 3 or 4 by MONTHERMER. " Costain, Thomas. A History of the Plantagenets, Vol III.
Green, Mary Anna Everett. Lives of the Princesses of England. London: Henry Colburn, 1850.