[@Renny]
Lol that's good xD I've had partners get annoyed before with all my ideas I throw out haha.

We could have it later on, after things have settled with the Poe idea and he finds the Tatooine girl. Basically after all the main stuff we have planned so that it doesnt interfer with our other ideas. 
When I think of a kid of hers and Ben's, I think of them having a daughter, maybe curly raven hair like his, but blue eyes like Odettes. I'm thinking of her being a very quiet child, not speaking much. But instead, when she wants to tell someone something, she uses the Force. Like when shes younger, she places a hand on the person's cheek and they can see what she's asking for or trying to see through images.

I can see Odette deciding to keep her, though of course has to hide her away. Like Ben gets confused as over time his battles with Rey and the others continje, yet where as before Odette was always there, it's almost as though she's disappeared and stopped fighting (because she's hidden away with their daughter). 

One idea I had was maybe there's one point where Odette has to go somewhere and leaves the daughter in someone else's care (could be a NPC or an actual character), to which Ben attacks, killing the person and is ready to kill the child as well, not knowing she's his child. Only, she innocently approaches him and does the whole communicating through touch thing. Seeing the child is extremely strong in the Force, he decides the child will be the perfect padawan for him, young enough to mold her mind in the ways of the dark side. And so he steals her away, sending Odette into a panic when she finds out, going to face Ben and get her back, while hoping to keep him from hiding out the girl is his child.

Another option for an idea was that after killing the person watching the girl, Ben leaves the child there and after exiting the building sets it aflame. Odette finally returns to find the building in ashes and, thinking the girl died (in reality she would have been secretly saved by one of the others unknown to Ben and Odette). Believing her daughter to have been killed by Ben, who's there waiting for her to fight her, Odette is sent into a rage (something no one, even Ben, has seen before in her), fighting him to kill and screaming at him that he just killed his daughter, etc). 
Maybe, if we wantwd to go this way, that even being a turning point for Odette, leading her to the dark side (not working with Ben, but out to kill him for the death of their daughter in her anger and grief).

Or if you have any ideas of your own for such and situation, let me know xD