Assuming that Luke is Rey's dad and that there was a mother figure out there as well at one point I just think things are so drastically different from the EU by now that there would be little point in incorporating Mara Jade into the story because she would be a totally different character anyways. We know that Luke was off on his own doing his Jedi training thing as early as the Aftermath trilogy. And we also know that by the time of TFA this potential mother/wife figure had had little to no contact with Han and Leia, had a daughter that was kidnapped about the age of 5, and was likely already dead. By this time what would be the point of giving Luke's wife from the new canon the same name of the wife he had in the EU who became a Jedi and fought in a war? In my opinion if they are going to bring back any of the EU created Skywalker/Solo characters it should be Jaina. If they have Rey have a daughter and give her the name Jaina she could have a fairly similar story to the EU Jaina in that she had strong lineage ties to the Skywalker/Solo families and she would grow up to become one of the first great heroes of the New Jedi Order.